archaeit-101222083804-phpapp01
TRANSCRIPT
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Archaeological Information ManagementE.S.Lohse
Archaeological Collections: Electronic DatabasesContemporary archaeology must move from simple artifact collection to a charge to
collect, organize and distribute archaeological information. Excavations, testing and
survey produce artifacts and documentation that constitutes archaeological data. This
data must be harvested, salvaged and used for research and education purposes if
archaeology is to fulfill its potential of informing us about ourselves in the past and in the
present. The traditional practice of carefully storing special artifacts away in secure
drawers behind locked doors is no longer viable. Archaeologists are no longer working
on shoe-string budgets on individually designed research projects. Archaeology is now
funded by nation states and corporations, with contracted work mandated by laws and
regulations. Research requires permits and consultation with governmental and
advocacy groups. The scope of research is directed by contractual agreements and
resulting information is required to be published and distributed within approved venues.
Old work must be integrated in new work, and old and new collections must be securely
and carefully stored for future generations. This paper addresses the current state of
archaeological knowledge handling, and emphasizes that archaeologists must move
aggressively to computer information systems as the primary way to curate and
distribute archaeological knowledge.
Stewart (1997), in summarizing the course of archaeological data moving to
information, identified the “Great Chain of Being” in archaeological computing, moving
inexorably in logical stages from data collection, to data management, to data analysis,
and on to dissemination. Stewart notes, however, that we can appraise archaeological
use of IT and information systems as more of a complex, multi-stranded web than as a
linear feature on the computing landscape. Archaeological IT venues now cover
quantitative methods, statistics and classification, archaeometry, visualization (including
imaging, CAD, multimedia and virtual reality), expert systems, artificial intelligence, and
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GIS. All depend on effective design of usable digital archives and databases. This
assessment should not ignore enhanced education and publication venues as well (for
a history of the development of archaeological computing, see Booth 1995; Hansen
1993; Lock 1995; Reilly and Rahtz 1992; Webb 1986).
The term “database” became common in archaeology by the 1980s, supplanting the
earlier label “databanks” (Moffett 1984). Wilcox (1978) made one of the strongest early
pleas for use of personal computing and microcomputers to aid in site recording and
data retrieval, data analysis, and publication. Booth (1982) and Stewart (1980)
published some of the first articles on use of microcomputers and relational database
management systems. By 1988, Nick Ryan published a bibliography of over seven
hundred publications in eleven different categories on computer applications in
archaeology (Ryan 1988). By the 1990s, numbers of articles on a wide range of
computing venues expanded dramatically, causing Ucko (1992) to speculate on the
dramatic impact of computers and IT on archaeology (cf. Cheetham and Haigh 1992;
Hansen 1993). Today, computerization is a given, and there has been a decided shift
toward use of industry standard software and evolving standards for data recording and
retrieval. At the same time, government organizations are investigating moves toward
encompassing strategies for digital data management (Booth 1995; Clubb and Startin
1995; Clubb and Lang 1996; Murray 1995). The shift is away from straightforward data
collection to increasing public access (Booth 1996).
Stewart (1997) argues that the central issue to emerge in over twenty-five years of
archaeological computing is whether there has developed greater physical and
intellectual access to archaeology. We still are struggling to bring archaeological
collections as digital archives into arenas of ever greater professional and public
access. The backlog of information seems daunting, and though successful pilot
projects can be cited, we still are unsure of our level of success (cf. Stewart 1995;
Niccolucci and D’Anrea 2002).
The Need for Informatics and Data Theory
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These and other efforts are attempting to bring information online to support
scientific communication across disciplines and across the world. Accessible databases
are key, and accessibility is directed by success in defining standards and guidelines for
practice. Archaeological databases today cannot be static compilations of text fields and
numbers. Databases must strive to bring collections and documentation information to
users in dynamic environments. We must also design these databases to be
sustainable over the long term.
The use of electronic media to enhance communication is a major shift in the
conduct of science. Pure access to information is a boon to scientists as is their ability
to handle massive amounts of information. Cross-disciplinary and international
collaborations are booming. Keys to nurturing this shift in the computer realm are
building adequate metadata, migrating data and controlling access to information. Kling
and McKim (1998) express concern over unsupportable risks rising if this transformation
in scientific communication occurs in a pure laissez-faire environment. They point out
that we cannot assume that “everyone will catch on” to using e-media structures
eventually. They also argue that we cannot simply assume that various e-media
initiatives reflect a creative period of problem-solving. Perhaps these developments
instead reflect runaway agendas and proprietary interests that will eventually retard use
of powerful electronic venues. Kling and McKim are informatics analysts, and view a
lack of theory guiding this process as potentially hazardous. They note that huge
amounts of money, resources, and effort are being committed by government agencies,
by private firms and organizations, by academic departments, by publishers, by
professional societies, and by individual researchers for the development, maintenance
and promotion of variable communications technologies for the sciences. At the same
time, scientists and policy-makers have no accepted theory of how scholarly fields
should adopt and shape technology. Producers and users instead tend to work within
context-free models. Often, the result is ongoing prototyping and fledgling projects with
high promise and withered funding (e.g., Eiteljorg 2003). This result wastes funding,
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denies the efforts of researchers, and highlights the serious plight of data orphaned and
dying in marginal, decaying, dead systems and formats.
A powerful response to this lack of an information paradigm is the so-called
electronic communication reform movement, which has been recognized in the field of
e-publishing, but these concerns extend across all e-media(cf. Kling and Iacono1995;
Iacono and Kling 1996). Core instigators include a range of well known scientists (e.g.
Paul Ginsparg and Paul Harnard). Harnard is an outspoken advocate of radically
decentralized scholarly publishing that may or may not be peer-reviewed (cf. Brent
1995), and is the editor of the electronic journal “Psycholoquy.” He is also the originator
of the concept “scholarly skywriting,” where scientific communication is confined to
short, discursive, iterative bursts of e-communication (Harnad 1991). Ginsparg was a
developer of the Los Alamos National Labs Physics E-Print Server, a working paper
server used by high-energy physicists. This venue has found acceptance in the
communications system of that field (Odlyzko 1996). Many in the scientific e-
communication audience are accepting the admonishments of outside-the-box thinkers
like Harnad and Ginsparg, prompting analysts like Morton (1997) to identify a paradigm
shift toward electronic communication and away from hard-copy journals and archives,
in all forms, whether centralized or decentralized.
There is a shared ideology in this movement. The basic precept is that electronic
media is better than traditional media: e-communication will be less expensive, access
to e-media will be easier and wider, and systematic use of e-media will dramatically
speed up scientific communication (Kling and McKim 1998:2; Brent 1995). Examples of
actions subversive to the established publication industry abound in the field of e-
communication. The editors and organizers of the “Electronic Transactions on Artificial
Intelligence” (ETAI) have created an open article review process (ETAI 1997; Sandewall
1998). ETAI reviews in two phases: after submission, the article is open to public online
discussion for a period of three months; after author response, the article is reviewed for
acceptance using confidential peer review and journal level quality criteria. Another AI
journal, the “Journal of Artificial Intelligence” (JAIR), emphasizes online appendices and
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discussions of published articles. Scholars are encouraged to cite JAIR’s articles as
they would articles in paper journals, but JAIR is distributed without charge on the
Internet (Kling and Covi 1995).
The overriding characteristics of the e-media explosion in science communication
are differences in structures, roles and uses from one discipline or field to another.
Designing electronic applications in this new age will require close attention to the social
contexts in which scientists operate. Scientists in different arenas use e-resources very
differently in the conduct of their basic research and communication (Kling and Covi
1995; Walsh and Bayma 1996; Finholt and Brooks 1997; Kling and Covi 1997; Walsh
and Bayma 1997). Examples abound. The discipline of Particle Physics uses the E-Print
server at Los Alamos National Labs, and preprint servers at CERN, DESY and the
American Physical Society. Biologists tend to depend on broader access supplied by
publication of papers in archival journals, but researchers use digital databases like the
Protein Data Bank, Flybase, and Saccharomyces Genome Database, as repositories for
genomic sequences published in refereed journals (Letovsky 1998, 1999). The
discipline of information systems has created ISWORLD, an extensive, distributed web-
based collection of links, papers, course syllabi, tools and resources, sponsored by
“MIS Quarterly.”
Not all disciplines have followed the lead of particle physics in opening up papers
online. The American Psychological Association (1996) admonishes authors not to
place papers online at any stage. The American Chemical Society (1996) has a similar
policy regarding papers considered for publication in its journal. Not all scientific
societies are as strict with authors. The Association for Computing Machinery (1995)
copyright policy states that authors retain rights to their work including unlimited reuse
of the work with citation of ACM. The ACM sees its role not as sole provider but as
facilitator of information access. Similar policies are held in many computer applications
journals and newsletters in archaeology, such as “Internet Archaeology” (Internet
Archaeology 2003; Richards, Heyworth and Winters 2000; Winters 2002), and in the
major professional journal “Antiquity” (cf. Champion 1997).
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All e-forms, including pure e-journals, databases, and preprint servers are highly
valuable for communication within and across disciplines. Disciplines have different
strictures but access to data is a primary concern (cf. Mark Bide and Associates 2000).
For our discussion, it is important to note that friction arises between disciplines
emphasizing use of shared, static-but-growing databases like archaeologists and
biologists and disciplines that do not like computer science. Commonality is in wanting
to access data in shared electronic environments and in rapidly and easily
communicating with other scholars. These kinds of questions represent a growing body
of research about information technology and social change called Social Informatics
(MacKenzie and Wajcman 1985; Silverstone and Hirsch 1992; Williams 1997).
The social shaping of scientific communication systems includes: access to
resources including data; speed of work and results-sharing; selection of target
audiences for research, allocation of credit for work performed, and allocation of
professional status (cf. DiMaggio and Powell 1991). Kling and McKim (1998)
acknowledge that trust plays a central role in the articulation of all issues within all
disciplines. Scientists will only use a report if they are assured that it is legitimate.
Formal peer review is only one traditional process of legitimation. To be willing to share
information, scholars must have confidence that dissemination will not harm future
access to resources or their career enhancement.
Important issues in determining how actors in social systems work focus on required
research project costs, mutual visibility of the ongoing work, the degree of industrial or
corporate integration, and the degree of concentration of communication channels.
Costs can affect communication structures by requiring greater collaboration. Costs
may also increase visibility at the expense of imposition of greater and greater control.
Visibility is always a concern. Practitioners in some disciplines like Particle Physics
share research results online before publication. In other disciplines, researchers are
not aware of colleagues’ work because of sanctions requiring publication in formal peer-
reviewed settings. Increasingly transparent distribution systems may cause actors to
perceive lower risks correlated with sharing reports and data. Market trends buck this
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revelation, however, since industrial or corporate support, while a commendable boon to
accelerated research and development, typically creates authoritative, owner-driven
sanctions on information dissemination. Here, systems are opaque, hidden behind
secure doors. Release is carefully controlled, if allowed, and timing is geared to
corporate advantage and profit margin. Much of what we now do lies between these two
poles: open access and controlled access (cf. Williams 1997).
Database projects have been particularly prone to boom and bust cycles.
Development is prompted by high promise and demise is driven by low scholarly
acceptance or limited funding accrual. Star and Ruhleder (1996) record the creation of
an online “Worm Community System” for molecular biologists, which proved too
complicated and technical for the larger community of its users. It was abandoned and
recast as the web-based system “A.C. Elegans DataBase (ACEDB),” which has won
greater acceptance. Letovsky (1998) reported that many biologists initially invested in
the “Genome Database” (The Genome Database 2003) Human Genome Project,” only
to see financial support withdrawn because funders did not see adequate value for their
constituencies. The demise of the heralded “Archaeological Data Archive Project”
(Eiteljorg 2003) is an example for our own discipline.
Archaeological Data: Practical ConstructionsPerring and Vince, in an online project outline titled “Liberating Archaeological Data”
(1999), set out an online guide for bringing archaeological data out to view. The
expressed aim of their proposal is to describe ways of using IT to facilitate presentation
and dissemination of complex archaeological data. They admonish that this will unlock
research potential for classes of data and will encourage more amibitious approaches to
the study of archaeological sites, landscapes and assemblages. They cite Hodder
(1998) on how the Internet impacts organization of archaeological knowledge, allowing
a shift from hierarchical structures to open networks and flows. Though these impacts
have been documented, the majority of the archaeological community seems unaware
of the implications of these new approaches. This may be a direct result of the reality
that most archaeological research is initiated under national, federal and state
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mandates that do not favor innovative approaches. Archaeologists would seem to be
running an appreciable risk: that establishing a commercial basis for archaeological
research will fossilize research practice along traditional lines.
Archaeological typology practices and classification methods are obvious areas
where innovations in thinking will have to take place, gearing to producing optimal
structures in the organization of archaeological data that will be accessed and
distributed in electronic networks. Interpretive structures will have to be devised which
permit variable ways of grouping data. For instance, higher order groupings structuring
archaeological data (phase compilations and typologies) will have to be supplemented
by alternative analytical divisions of the data (e.g., functional classes irrespective of
material type; deposition classes; competing spatial and sequential boundaries).
Different conceptualizations of data structure will be required to develop flexible and
analytical data structures.
Perring and Vince (1999) list obvious shortfalls in traditional database constructions.
Results from excavations of complex archaeological sites are notoriously difficult to
study, and both published and “grey literature” reports commonly report on only a
fraction of the available evidence. Traditional interpretations typically follow a rigid linear
framework based on chronological groupings cast from stratigraphic analyses, providing
concrete narratives for successful publication, in which structures, sequences and
assemblages are built on reconstructed landscapes. Problems inherent in recasting
these structures to electronic databases include: post-excavation procedures are limited
by intractable data sets; important data remain inaccessible to the research community
because revising the structure is simply so expensive; there is a lack of integration
allowing descriptions of different data classes published in specialist reports to be linked
in the overall data structure; data structures are specific to individual investigations of
specific sites and data classes, limiting potential for synthesis with other investigations
using different data structures; research potential is effectively curtailed by narrowly
defined data structures.
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There are new methodologies that can be imposed in resurrecting and organizing
effective data structures but without new conceptual organizing approaches these will
only compound, not transcend the limitations noted. We cannot simply enter new data in
old structures into IT developments (HTML, interrelational databases, and GIS), and
expect to have working databases. The theory driven structure of the data must be
revised, coupled with advances in IT.
The 2000 Society for American Archaeology session “Digital Data: Preservation and
Re-Use” saw many of these issues addressed. Robinson (2000) summarized work on
the “Digital Archiving Pilot Project for Excavation Records” (DAPPER). DAPPER was a
collaborative venture between the Archaeology Data Service (ADS), English Heritage,
the Museum of London Archaeology Service (MOLAS) and the Oxford Archaeological
Unit. It focused on how digital project information could be most effectively archived,
how best to deliver data over the Internet, what was the best costed model for archiving
and delivery, how to assess user reaction to digital project archives, provide examples
of best practice in archiving, and explore the close relationship between digital archiving
and publication. Robinson points out that a traditional archive documenting an
archaeological project would be transferred to a museum, although Swain’s (1999)
survey of archaeological archives in England concludes that most museums do not
have the technology to store, access and curate archives containing computer files.
Condron et al. (1999) reinforces this assessment. DAPPER was a pragmatic approach
to the imminent threat of systematic loss of electronic archaeological data.
Two large high profile collections were chosen as the ADS pilot study: the Royal
Opera House excavated by the Museum of London Archaeology Service and Eysham
Abbey excavated by the Oxford Archaeological Unit. Both projects were at the
dissemination stage and had different sorts of digital archives to deposit. The projects
were done by two different archaeological units with different working practices.
The Eynsham Abby digital archive contained text files, databases in comma
delimited text, JPG images, a 3-D reconstruction of the medieval abbey, and digitized
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drawings. The Royal Opera House archive consisted of database files and GIS files
summarizing context, artifact and ecofact attribute sets (Robinson 2000).
These data sets were designed to be accessed using the Archaeology Data Service
ArchSearch Catalog. Site metadata records can now be searched using keywords.
Flagged records can then be followed to more detailed catalog records. A Project
Archive button in the left hand frame of the ArchSearch window allows the user to list
projects with downloadable resources. Both the MOLAS and OAU have hotlinks to
connect their own web pages to the DAPPER project archives.
A central issue in resource delivery was the user interface, and whether this should
be aesthetically pleasing or simply allow clean access to raw data. Emphasis on
usability was abandoned in the development phase because it was deemed very
expensive and perhaps would have created problems in the realm of data migration.
The compromise was to present data in standard formats with online support
documentation to spur data reuse. This was seen as sustainable and more cost-
effective.
The Archaeology Data Service receives core funding from the UK Higher Education
sector and aims its data resources at the scholarly community. The ADS has sought
funding to repurpose the DAPPER raw data into Internet deliverable teaching modules
to enhance future use of the digital excavation archives.
Cost was summarized by Robinson (2000) and is an interesting footnote to our
discussion of digital archiving. Robinson reports that digital archiving of Eynsham
Abbey cost 1.2% of the excavation and post-excavation budgets. Digital archiving of the
Royal Opera House collections cost .1% of the total project cost. The cost difference is
attributed to differences in analysis during the post-excavation stage on the projects.
For example, digital stratigraphic drawings are available for both sites, but the ROH-
MOLAS excavation used GIS, creating three deposit files, while Eynsham Abbey, done
in CAD, deposited 404 site plan files, 80 structure plans, 15 phase plans, two sections,
a trench plan, a composite plan, and a 3-D reconstruction. Robinson notes, however,
that it is not a question of whether GIS or CAD is most cost-effective. The GIS archive
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requires special training to use. The CAD archive is constructed like a digital
publication, with separate structure and phase plans. The GIS database is a more
powerful research venue while the CAD archive is the better nonspecialist venue.
The Archaeology Data Service has recognized that the Royal Opera House and
Eynsham Abbey projects are showy, high profile, well funded excavation projects, and
that many archaeological projects will not merit this level of attention and expenditure.
ADS-DAPPER defined four different levels of digital archive. The index level archive or
minimum digital archive, where the project did not merit further assessment work. This
contains an index record for the ADS catalog and a site summary document. The
assessment level archive or larger digital archive, which maintains an index record, the
project design, the assessment report, specialist level databases, and a site matrix. The
research level archive, a large, complex digital archive, warranted when the project is
seen to be significant for analysis beyond the assessment performed. This archive is
not integrated into the final project report and holds the results of analytical and
publication process. It will contain an index record, a project design, the research
database with stratigraphic databases, digital plans, site matrix, artifactual and
ecofactual databases, the site, and artifactual and ecofactual reports. Finally, the
integrated archive, which holds scholarship resulting from ongoing analysis of projects
published as traditional archaeological monographs, linking texts seamlessly with the
digital site archive. Users should be able to query the range of site data through various
interfaces, including searchable relational databases and web-based GIS. The potential
is to bring unwieldy technical data out of the excavation report and locate it in a
universally accessible digital environment.
DAPPER constitutes the first functional online digital project archive. It created a
costed model for the ADS in working with commercial archaeology. It also resulted in
reassessment of post-excavation procedures and documentation methods implemented
by the Museum of London Archaeological Service and the Oxford Archaeological Unit.
DAPPER suggests that digital archiving can proceed for less than 5-1% of the total
archaeological project budget. DAPPER has also received high numbers of visitors who
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have downloaded thousands of digital files. The DAPPER resources have also been
used as teaching data sets in the Archaeological Information Systems Masters degree
developed by the University of York.
Eitlejorg (2000) admonishes that the real goal of any digital archive project is to
ensure reuse of the data. He considers three kind of digital data: databases, CAD
models, and GIS data sets, chosen because they require access in a highly interactive
digital environment. Eiteljorg in particular is concerned with the skills needed by users to
access these materials, identifying four distinct levels: skills needed to use data files if
the appropriate software is available; skills required if the files are not in the format
required by the user; skills needed to evaluate the quality of the data; and skills needed
to aggregate the data.
It is axiomatic that data will be stored in formats devised by other scholars. This data
will have been organized according to the needs and perceptions of this original
scholar, so the user must know something about how the original data were gathered,
organized, entered and stored. For example, in a CAD model the user must know how
the model has been segmented and how the data segments have been incorporated
into the CAD layer names. For GIS data sets, the user must know the scales used for
the map data, and how the data tables were constructed.
Data translations will be tricky for the user of the digital archive. An example cited by
Eitlejorg is the DBF format used in dBase. Moving the data tables is straightforward but
the user will encounter problems in complex databases with related or linked tables.
These relationships are not included in the DBF format and must be specified in
accompanying documentation. The user must have access to this documentation.
Data quality evaluations will be a constant concerns for digital archive users.
Questions about whether the data is primary or secondary in nature will be obvious. The
necessary scholarship framed in careful attributions will be required documentation.
Questions concerning whether all potential data were reported on are pertinent. Was
collection methodology systematic? How were corrections to the data made? Have
these modifications to the original data sets been tracked? Evaluation of the digital data
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is a time consuming and complex task requiring high levels of professional expertise.
Without adequate documentation the information needed for users of the digital archive
is lost. As Eiteljorg (2000) notes, data producers and users must instruct the archives,
even carefully designed projects like the Archaeology Data Service. Producers and
users must provide the parameters for data manipulation.
Metadata that documents the data resource, specifying the information that the user
needs to adequately use and explore the digital resource, is the required bridge
between data and data use (Cartney and Robertson 2000; Michener et al. 1997).
MetadataMetadata can be defined as data about data, and provides information essential to
use of any database (cf. Quine 2001 on role of data standards). Metadata can refer to
an agreed upon set of fields and associated lexicon or it can be a detailed description of
measurements systems and rules for application. Metadata are required so that the
user can make intelligent decisions in selecting, using, adding to, or translating a
database. A library card catalogue holds metadata that allows users to find particular
books. Maps include metadata as scales, dates of survey, and dates of publication. For
electronic resources, there are an increasingly large number of standards. MARC, a
Machine Readable Catalog, is used in library cataloguing (British Library 1980; Library
of Congress 1994). The Text Encoding Initiative (TEI) allows standardized description of
electronic texts. The Directory Interchange Format (DIF) provides metadata for satellite
imagery (GCMD 1996). The U.S. National Spatial Data Infrastructure (NSDI)
approaches complex descriptions of spatial data. Content standards have been defined
for U.S. geospatial metadata (CSDGM 2003; FGDC 1997) The U.K. National Geospatial
Database (Nanson et al. 1995) integrates governmental and nongovernmental spatial
data. NASA has produced the Global Change Master Directory, which presents a
writer’s guide for DIF - Directory Interchange Format (NASA 2003).
Miller (1997:4) characterizes these kinds of schemes as extremely complex and
geared explicitly to creation by experts and interpretation by computers, rather than
designed to facilitate information dispersal to as wide a range of users as possible. They
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operate within a narrowly defined field of work and are not suited to describe wide
ranges of resources. Miller applauds eLib projects such ROADS and ADAM. The Arts
and Humanities Data Service (AHDS) for archaeology, history, text and the performing
arts is seen as particularly productive. Both AHDS and ADAM use the Dublin Core
Metadata Element Set (cf. Miller 1996, 1997a, 1997b).
The Dublin Core has been developed to supply metadata descriptions between the
crude metadata of search engines and the complex systems developed for MARC and
the Federal Geographic Data Committee (FGDC 1994) (Dempsey 1996; Dublin Core
2002). The Dublin Core model can describe resources available on the Internet and can
be used to insert a range of file types from simple HyperText Markup Language (HTML)
to Postscript files and other image formats (Miller 1996; Weibel 1996). The Dublin Core
consists of thirteen core elements, each of which can be extended by use of Scheme
and Type qualifiers.
Scheme and Type qualifiers are used to better describe the resource. The Scheme
qualifier identifies any recognized coding system used in the description of a specific
Dublin Core element, and allows consistency and standardization. Scheme should only
refer to an existing coding system such as the Internet Media Type (IMT) or to the
International Standards Organization standard on dates (ISO31). The Type qualifier is
used to identify, as in a name, email address, or the like.
Designers feel that any necessary extensions of the Dublin Core should be included
in a separate framework as in the Warwick Framework (Lagoze et al. 1996).
Descriptions stored there may be from a different metadata scheme such as DIF or
FGDC, or could be simple extensions for the thirteen Dublin Core elements.
Databases
Metadata associated with a database should act to improve or restrict access to
data, facilitate sharing and interoperability, and characterize and index data. Metadata
designed to support data quality and longevity is the inherent concern of any database
construction.
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Rothenberg (1995) offers a succinct overview of the factors to be considered in
database design and development, and focuses specifically on inherent problems in
maintaining digital records as software becomes .
Rothenberg (1995) admonishes that data are a model of the real world, a description
that is arbitrary and biased. Data models incorporate very different data views. For
example, the speed of an object through a medium might be measured as slow -
medium - fast, as a single numerical value as in 20mph, or as a table of numerical
values. The choice of the kind of data to produce is decided prior to the building of the
data model.
Rothenberg (1997), in discussing verification, validation and certification of data
quality, notes that the assessment cannot be a binary value as in good or bad. It must
instead be evaluated in the specific context of use, and seen as a desire to move from
evaluation to improved quality. He notes two quality attributes: objective correctness
(accuracy and consistency) and appropriateness for the intended purpose. It is
axiomatic that data users will not be able to control data quality if data are taken from
outside or intermediate sources. All data must be augmented with metadata to record
information needed to assess data quality, record the results of assessments, and
support process control. Producers must perform explicit verification, validation, and
certification on the data, using metadata to direct this activity and to record results.
Producers must also establish control over the data processes to improve data
transformations, using metadata to support this activity and to record the results.
Rothenberg (1996:6-8) lists contextual categories for data quality that include
adequate description and meaning, specification of intended use and range of purposes
and constraints, requirements for access and use, description and rationale for structure
or design, global relationships to other databases, and update cycle information. Source
information includes identification of source and assessment of source credibility,
characterization of classification, accessibility and reproducibility, and clear notice of
release authority. Rothenberg (1996:6-8) lists other criteria, including data-element and
data-value metadata.
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Limited media life and rapid obsolescence of software and hardware highlight the
need for concern with longevity of electronic data records. Increasing use of graphics,
hypertext, linked structures and multimedia only accelerates this projected
obsolescence. Data records are becoming increasingly dependent on specific software
for continued interpretation. Data files will become increasingly useless without software
to interpret the structure and meaning. Traditional hard copy documents and records
have linear content that is relatively independent of this concern. For electronic media,
record keeping paradigms are essential, and are evolving in direct response to
accelerating software paradigm changes (Michelson and Rothenberg 1992).
We should save original records, and importantly, we need to save application
software and descriptions of the required hardware environment as prerequisites of
constructing emulators in the future. Compression should not be considered an option.
Saved bit-streams should be copied verbatim. Annotated metadata must be transparent
and act as a “bootstrap standard” (remember that ASCII will change to Unicode to some
other standard) (cf. Rothenberg 1996).
Information StandardsMuch of the current discussion on information standards in archaeology is headed
by the Getty Information Institute and the International Committee for Documentation of
the International Council of Museums. These two organizations sponsored an initial
meeting on the urgent need for standards in Canterbury, England, in September 1991.
Results of this overview were published in a brochure titled “Developments in
International Museum and Cultural Heritage Information Standards,” first published in
1993 and updated in July 1995.
Standards are models that organizations, projects, and vendors can use as the basis
for creating information systems and guidelines. These are rules for structuring
information, enabling data entered into the system to be reliably read, sorted, indexed,
retrieved and distributed between systems. The most compelling reason for standards is
to ensure that the data will have long term value. It should be acknowledged that the
largest investment in building any database is in the cost of assembling the data and the
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time required to enter them into the system. Further, all computer technology will
change routinely and all systems will need to be upgraded and data moved to different
hardware and software. Standards ensure that the database is consistent internally and
permit data to be formatted and stored for export to other systems.
Standards can vary from strict forms to flexible guidelines developed for specific
institutions. Three standards are commonly defined: technical standards are exacting
(e.g.,
The ASCII character set of 128 codes defines alphabet, numbers, punctuation, and
control codes for text processing and data communication); conventions are more
flexible than technical standards (e.g., the MARC formats and Museum Documentation
Association Data Standard); guidelines are broad sets of practical criteria against which
products are measured (e.g., style manuals).
International and information standards recognized by museums and cultural
heritage organizations constitute four main groups: information system standards define
the functional components of the information systems used; data standards define the
structure, content, and values that collections information comprises; procedural
standards define the documentation procedures required for system management;
Information interchange standards define the technical framework for exchanging
information. (e.g., ISO 8879 or Standard Generalized Markup Language - SGML).
An infrastructure of agreed upon standards will make development of shared text
and image databases much easier, will ensure quality, allow reuse of information, and
create effective transfers of information. National bodies like the International
Organization for Standards (ISO), the American National Standards Institute (ANSI) or
the British Standards Institute (BSI) will publish and maintain standards once these are
approved. Groups like the Getty Information Institute and CIDOC will focus interest and
lobby for standards for particular disciplines and applications.
Selected guidelines for museum records development have been recognized by
CIDOC as part of “International Guidelines for Museum Object Information: The CIDOC
Information Categories” (CIDOC 1995, 2003a, 2003b). ICOM-CIDOC also maintains
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lists of museums and cultural heritage information organiations that concentrate on
standards, and importantly, successful museum documentation initiatives or projects
(ICOM-CIDOC 2002). The list of important international and national projects and
organizations is growing routinely (cf. ICOMOS Documentation Centre 2003).
Australia: Australian Museums and Galleries Online (AMOL) is Australia’s online
cultural heritage resource. AMOL offers details of museums, art galleries and historical
societies across Australia. Over four hundred thousand item records represent thirty-six
cultural heritage collections. Users are offered online museum forums, an online peer
reviewed journal, and consultations in museum resource areas.
Canada:The Bureau of Canadian Archivists’ Planning Committee on Descriptive
Standards has issued a data content standard, “Rules for Archival Description” (RAD)
for Canadian archives. RAD is based on the International Standard for Bibliographic
Description, and archival descriptive records based on RAD can produce records in
MARC format. The Canadian Heritage Information Network (CHIN), a branch of the Arts
and Heritage Sector of Communications Canada, maintains the national inventory of
Canadian collections and offers services to museums, including automated collections
management and advice on documentation standards and new technology. CHIN offers
international access to various specialized databases on natural and cultural heritage
through partnerships like the Conservation Information Network (CIN). CHIN is a
participant in the International Committee for Documentation (CIDOC) of the
International Council of Museums (ICOM).
United Kingdom and Europe: The Archaeology Data Service (ADS), a branch of the
Arts and Humanities Data Service (AHDS), supports research, learning and teaching
through dissemination of high quality digital resources in archaeology, offers technical
advice to the research community, and produces guides for good practice (ADS 2003a,
2003b; AHDS 2003; Bergrie and Greenstein 1998; Burnard and Short 1994; Greenstein
and Trant 1996; Richards 1996; Richards and Robinson 2000; Wissenburg 1997). The
ADS maintains an ARCHSearch Catalog, an ARCHway of journal holdings from twenty-
five UK research libraries, the HEIRPORT or Historical Environment Portal with
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resources from ADS (cf. Baker et al. 2000; Cultural Heritage Consortium 2002; Fernie
2003; HEIRNET 2002), the Royal Commission on the Ancient and Historic Monuments
of Scotland (see Mowat 2002 for an overview of SCRAN), and the Portable Antiquities
Scheme, and the Society of Antiquaries Library Catalog. ADS projects include “Digital
Archiving Pilot Project: Excavation Records”(DAPPER) for English Heritage (1999),
“Archaeological Records of Europe Network Access Project” (ARENA) for the European
Commission, “Online Access to the Index of Archaeological Investigations” (OASIS) for
RSLP and English Heritage, and “Publications and Archives in Teaching with Online
Information Sources” (PATOIS) for JISC. Hunter and Ralston (1997) offer a cogent
summary of archaeological resource management in the United Kingdom.
The International Committee for Documentation of the International Council of
Museums (CIDOC) has over 700 members in sixty-five countries. It supports many
working groups concerned with standards issues (Crofts et al. 2003). The
Archaeological Sites Working Group collaborates with national sites and monuments
organizations and the Council of Europe in developing standards for site documentation
(Council of Europe 1995). The Documentation Working Group compares museum data
standards and is refining a Data Model incorporating practical standards and reviews of
terminology resources. An example project using this standard is the “Network of Art
Research Computer Image Systems in Europe (NARCISSE). Other important working
groups include the Iconography Working Group examining classification schemes for
iconography and the Multimedia Working Group examining standards for application of
multimedia technology. The Museum Documentation Association has produced
SPECTRUM, the UK museum documentation standard (MDA 1997).
The Inventaire General des Monuments et des Richesses Artistiques de la France,
under the French Ministry of Culture, is responsible for recording all cultural property in
two databases: I-ARCHI, which inventories architecture and the built environment, and
I-OBJET, which holds information on movable objects. The Inventaire has developed
terminology authorities for Architecture, Objects Civils Domestiques, Le Mobilier
Domestique, La Sculpture, Tapisserie and Vitrail.
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The Istituto Centrale per il Catalago e la Documentazione (ICCD), part of the Italian
Ministry for Cultural and Environmental Property, maintains a database holding the
patrimony of Italy. The ICCD has produced catalog manuals and terminology
dictionaries outlining data content and data value standards for documenting Italian
heritage collections.
The Royal Commission on the Historical Monuments of England (RCHME) is
responsible for surveys and records on the historic environment of England, and
provides users with advice and information from publications and database records
(RCHME 1993, 1998; RCHME and English Heritage 1995). RCHME has developed the
“National Monuments Record” database, which indexes and correlates information on
architectural and archaeological sites and archives. RCHME has developed and
published information and data standards and guidelines for information levels
recording historic buildings and archaeological sites in England. RCHME also publishes
thesauri of architectural and archaeological terminology, and works closely with the
Council of Europe Division for Cultural Heritage on development and promotion of core
data standards for recording architectural and archaeological information in Europe.
United States: The Getty Information Institute seeks to make cultural heritage
information more accessible through computer networks in collaboration with domestic
and international institutions and organizations. The focus is on policy, standards, and
practice. Initiatives have been developed to define issues of access and distribution of
cultural information in networked environments. The Institute maintains research
databases offering content on effective creation, maintenance and retrieval of
information.
The Museum Computer Network (MCN) is a consortium of museums and individuals
promoting excellence in museum automated information systems. MCN formed the
“Computer Interchange of Museum Information” (CIMI) in 1990 to develop a standards
framework for exchange and sharing of data in museum environments (Moen 1998).
The Research Libraries Group (RLG) maintains a project to develop a “Cultural
Heritage and Museum Object Information Resource,” an initiative to improve access to
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information on works of art, architecture, visual culture, and materials culture held in
museums, historical societies and other cultural heritage institutions. The goal is a web-
accessible database of object records linked to visual images and associated texts.
Data is loaded from the “Reach Project, the Getty’s “Provenance Index,” and the “Vision
Project.” The “Reach Project” is an effort to create a testbed database of museum
object records, where machine-readable data from heterogeneous museum collection
management systems can be exported to analyze research value. The “Vision Project”
for shared visual resource records, is a joint effort of the RLG, the Visual Resources
Association, and the Getty Information Institute. Enhanced searching will use Getty
vocabularies: “The Art & Architecture Thesaurus” and the “Union List of Artist Names.”
The Council on Library and Information Resources, Library of Congress, has published
a national strategy for digital archiving (NDIIP 2002).
The Hammer of Federal and State Regulation: United StatesU.S. archaeological resource managers over the past decade have habitually
referred to a “curation crisis” wherein many museums and repositories cannot accept
new collections because of lack of proper funds and storage space (e.g., Thornbury
2002). The failure of ADAP and its electronic archive is a mirror of collection profiles in
general in the U.S. Even securely stored collections of artifacts and documentation
often do not meet Federal standards. They may not be stored properly, they may be at
immediate risk for deterioration, or they may never have been completely inventoried,
studied, or reported on. From our perspective, these collections cannot be easily
gathered up as orphans and entered into an electronic database. Careful salvage of
these collections is required, object and hard copy documentation needs to be secured
and stabilized, metadata written, and the whole transferred to electronic form. This is
salvage archaeology or data reclamation in its truest form, and the need for action is
paramount.
Legislation pertaining to archaeology in the United States does create a priority in
preserving the archaeological record but interpretation of State and Federal laws and
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regulations does allow considerable ambiguity. The Antiquities Act of 1906 asserts that
all objects must be “properly cared for” but contemporary archaeological research
recognizes the importance of records and metadata as well (Thompson 2000). Other
legislation like the Reservoir Salvage Act of 1960, the National Historic Preservation Act
of 1960, and the National Environmental Policy Act of 1969, installed further mandates
on the collection and care of archaeological objects and collections, though not
necessarily emphasizing maintenance and accessibility of hard copy records. Electronic
archives were certainly not highlighted nor even envisioned. King (2000) admonishes
that this body of legislation prompted a huge volume of archaeological research as part
of large and small scale projects performed to mitigate development activities. At the
same time, legislation and accompanying precedents and protocols failed to provide
effective procedures for protecting the collected artifacts and the growing
documentation.
The Archaeological Data Preservation Act (ADPA) of 1974 approached this problem
by urging concerns regarding protection of these collections. ADPA stated that the
Secretary of the Interior must consult with groups with the goal of determining
ownership of archaeological materials and decisions on deposit of these materials in an
appropriate repository. It also called for the Secretary of the Interior to issue regulations
re: curation of federal archaeological collections (National Park Service 2000). The
following Archaeological Resources Protection Act (ARPA) of 1979 strengthened
procedures requiring permits to conduct fieldwork, asserted federal ownership of
artifacts removed from federal lands, required collections to be stored in “federally
compliant” repositories, emphasized written agreements, and asserted that the
Secretary of the Interior should issue regulations on the care and management of
archaeological collections (Carnett 1991; Cheek 1991; National Park Service 2000).
Even with this emphasis, in 1987 the U.S. Government Accounting Office issued a
report with the following findings: many repositories had no collection inventories,
repositories had lost or destroyed records, collections had never been inspected for
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conservation needs, many had catalog backlogs, and there was insufficient storage
space to match anticipated future needs (USGAO 1987).
The Code of Federal Regulations Title 36 Part 79 (36 CFR 79), “Curation of
Federally-owned and Administrated Archaeological Collections,” 1990, mandated
guidelines for preserving and handling archaeological materials and associated
documentation Code of Federal Regulations 1990). It specifically charged federal
agencies with determining the capabilities of curation facilities. The Society for
American Archaeology responded in 1991 with a “Task Force for Curation,” which
resulted in the document “Urgent Preservation Needs for the Nation’s Archaeological
Collections, Records, and Reports” in 1993 (Childs 1995). These efforts were followed
with formation of an Advisory Committee on Curation who publicly presented the
curation issue in “Crisis in Curation: Problems and Solutions,” presented at the 65 th
Annual Meeting of the Society for American Archaeology (Bustard 2000). The
Committee highlighted continuing problems in curation in the March 2001 issue of the
“Society for American Archaeology Archaeological Record.” Immediate needs were
cited: better integrated field collection strategies, enhanced dependable collections
funding, improved long term care and maintenance of collections, priority in
deaccessioning collections, accreditation of repositories, improved access and use of
collections, and emphasis on public outreach and education through better access to
collections and “grey literature” (Childs 2001).
Complicating institutional improvements in establishing care of collections and
improvements in professional and public access to archaeological data was passage of
the “Native American Graves Protection and Repatriation Act” (NAGPRA) in 1990.
NAGPRA requires comprehensive inventory and repatriation of Native American human
remains and associated funerary and sacred objects and objects of “cultural patrimony.”
This legislation affected all museums receiving federal funding, and specified deadlines
for compliance and inventory assessment as well as penalties for noncompliance
(McManamon 1992). Repatriation issues moved to the fore, and federal and state
agencies, universities, museums and other repositories laid aside many curation and
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conservation issues to immediately deal with this strident political charge. Issues of
ownership and access restrictions served to derail much of the mandate established in
36 CFR 79 (cf. National Park Service 1997a,1997b, 2002; US Army Corps of Engineers
1999, 2003).
Thornbury (2002) summarizes State laws following changes in Federal legislation.
By 1991, fifteen states had passed laws, regulations or policies regarding management
of archaeological collections (Carnett 1991, 1995). By 1999, thirty-seven states cited
curatorial issues as paramount, highlighting required improvements in museum
accessioning and deaccessioning, imposition of curation fee schedules, and explicit
loan policies. Both 36 CFR 79 and NAGPRA have resulted in museums carefully
evaluating whether or not to assume responsibility for new accessions. Museums are
now raising costs and requirements for basic curation. Collections are becoming more
and more expensive to maintain. Unfortunately, dead storage or very limited access has
been a popular solution en lieu of adequate funding. Bustard (2000) cites lack of funds
as the major problem in the United States, noting that 36 CFR 79 provided standards for
curation but did not secure sources of federal funding. Costs have risen in all
categories: staffing, record updating, storage of artifacts, processing of loan requests,
purchase of archival quality boxes and polyethylene bags and acid-free paper, purchase
of computers and software, development of computer databases, and improvements in
physical structures and climatic controls.
Access to CollectionsMuseums in the United States, and elsewhere, are challenged by the prospect of
moving collection information online to provide greater access (Dunn 2000). Moving
information online is a logical reaction to rising costs of curation, display, and onsite
exhibitions. To be made available collections must be placed in management
databases, these databases must include item level metadata for public access, and all
improvements must aim at enhanced “resource discovery.” In a well designed
environment the actual database should be invisible to most users. Research and
development issues are many: collection level descriptions, standard terminology,
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secure but transparent access between organizations, across disciplines, among
resources with different content, and for audiences with varying expertise.
Many museums and organizations have now brought collections online, often
designing and managing their own websites. Many times these individual sites are
linked through principal gateways. These contain item-level descriptions and rich
images within distributed networks as in the Archaeological Data Service framework.
The emphasis is on data sharing among organizations that are interoperable at local,
national and global levels. The ideal is that collection-level descriptions follow a well
designed standard, that these databases are automatically, dynamically created to
match user requirements, and that they strive to be multi-lingual and provide semantic
links between object and class. Collection-level description should provide access for
both general and specific requests, regardless of user knowledge level, discipline, data
requirements, or language of users.
Significant resources are being produced by the Consortium for Interchange of
Museum Information (CIMI), which lists standards for museum resource description and
sponsored the CIMI “Dublin Core Testbed Project” in 1998. In this effort, seventeen
CIMI member organizations created object-level description using the Dublin Core
standard. Primary problems were found in characterizing resources as item-level or
collection-level. A “Guide to Best Practice” for museum collections was produced by
CIMI in 2000. Examination of resource description frameworks have lead to goals to
enable interoperability between applications exchanging metadata, and focused on
enhanced resource discovery, cataloging, and collection-level descriptions. In this vein,
use of Extensible Markup Language (XML) has been documented to offer significant
improvements toward achieving cross-domain interoperability (Dunn 2000; Crescioli,
D’Andrea and Niccolucci 2002; Schloen 2001). There is also a continuing emphasis on
developing sound knowledge representation tools like thesauri for specific disciplines.
Other fine efforts are being produced by the Canadian Heritage Information Network
(CHIN). CHIN is working toward developing terminology in collections-level descriptions
that is specific enough to allow users to decide whether they have found an appropriate
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resource, but general and descriptive enough so that people from a wide range of
disciplines and knowledge levels can discover the resource. For over twenty-five years,
Canadian museums have been contributing object-level metadata to collective resource
management led by CHIN. “Artefacts Canada” holds information on over two million
objects accessed through “The Great Canadian Guide,” using specialized and general
terms in English and French developed as the “Revised Nomenclature for Museum
Cataloging” (Blackaby, Greeno and the Nomenclature Committee 1988). To avoid
inconsistent nomenclature, CHIN has intergated Getty’s “Art & Architecture Thesaurus”
with “Artefacts Canada.” The AC records are visible to online search engines by
providing CHIN web pages with collections-level descriptions from the “Great Canadian
Guide.” The Guide serves as an online gateway to over twenty-four hundred Canadian
cultural institutions. It allows users to link collections-level descriptions to corresponding
object records in “Artefacts Canada.” The linkages are not automatic and still not always
successfu because of vagaries of class definitions. Controlled vocabularies like
classification rools and thesauri are emphasized. CHIN has also produced “Learning
with Museums,” presenting online educational materials using thesauri of subject areas
based on Canadian school curricula. CHIN is currently developing an initiative on
“Virtual Museums of Canada.”
Preservation of Data: ADS GuidlinesArchaeologists are good are creating data but are not good at arranging and
preserving data in ordered, accessibly public archives (cf. Richards 1997).
Archaeologists also tend not to be very proficient nor interested in reusing other
peoples’ data. The United Kingdom heritage community has been a consistent leader in
attempting to preserve collections and information about the past. UK research in
archaeology over the past thirty years has been very concerned about the preservation
and reuse of archaeological data. This has culminated in the mission of the Archaeology
Data Service, a branch of the Arts and Humanities Data Service (AHDS). AHDS-ADS
emerged from a 1994 feasibility study conducted by an Information Services Sub-
Committee (ISSC) of the Joint Information Systems Committee (JISC) of the UK Higher
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Education Funding Council (Burrand and Short 1994). This feasibility report
recommended creation of a central coordinating group to carry out management and
user-support functions for maintenance and operation of a comprehensive heritage
database. This organizational structure would support dispersed service providers for
particular disciplines or groups of disciplines.
The AHDS was formally established by the JISC in June 1995, based in King’s
College, London. Over twelve months, five discipline-based service providers were
recognized: Oxford Text Archive (OTA), Oxford University Computer Service; Historical
Data Service (HDS), The Data Archive, Essex University; Performing Arts Data Service
(PADS), University of Glasgow; Visual Arts Data Service (VADS), Surrey Institute of Art
and Design; and the Archaeology Data Service (ADS), University of York. Each of these
service providers were designated responsibility for their discipline’s data and were held
to develop standards definitions and guides for best practice for particular classes of
data. There was an AHDS-wide emphasis on spatial data, including GIS, which was
seen as essential for organizing all discipline’s data sets.
Envisioned was a distributed but integrated approach to data access. Metadata
needed to address discipline specific needs and problems, that economies of scale
required developing shared migration strategies for specific data types, and that a vision
needed to be developed for how researchers would conduct cross-disciplinary searches
from a desktop (text-objects-images). Reuse of data requires that users can locate the
data they require, and that this old data can be accessed in contemporary formats (cf.
Miller 1996; Wise and Miller 1997).
The explicit Archaeology Data Service goal was to collect, describe, catalog,
preserve, and provide user support for reuse of digital data generated in the course of
work by British archaeologists. The focus initially was on Britain but has shifted toward
worldwide application, since there were no stated geographic boundaries, and there
was an expressed interest in working with organizations in other countries to develop
reciprocal archiving policies. Directing development is the dispersed model, with
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archives linked by a single gateway to provide integrated access to distributed
collections.
ADS collections policy operates on two distinct fronts. First, facilitate access to
existing archives and second, accession orphan data sets. Orphan data sets were
common as residue of centuries of work recorded in national and regional Sites and
Monuments Records. Digital archiving on this ambitious scale requires development of
a national strategy. Various pilot studies have been developed in AHDS-ADS to work
with a range of data types to develop “costed models” for preservation of digital data.
These models must distinguish between issues of open public access versus stored
and maintained data that has not been released. Key issues include negotiated access,
copyright restrictions, and developer funding.
The Archaeology Data Service has moved to meet its mission through a strategy of
information sharing embodied in production of its “Guides to Good Practice” series,
which currently include guides to excavation and fieldwork, GIS, geophysical surveys,
and satellite imagery and aerial photography. Other guides will address databases and
sound and video images.
These guides to good practice perforce emphasize creation and preservation of
appropriate metadata, enabling the projected user to locate required data and to assess
data fitness. Metadata ranges from simply noting names of excavation directors to
detailed descriptions of equipment and software used to algorithms run in processing.
The overriding goal is to describe data content at a level sufficient to enable the
potential users to discover data resources. Indexing terms or keywords frame searches,
defining subjects, geographical areas, and chronological ranges. Keywords also help to
assess data quality and methods of recording, as well as reflecting changes in
intellectual and social context reflecting changes in theoretical frameworks. Recognizing
that there is no single set of standards for data description, the AHDS developed and
application of the Dublin Core (Weibel and Miller 1997) to enable searching of the
AHDS catalog through use of the Internet. Discipline-related fields were created through
application of the Warwick Framework (Dempsey and Weibel 1996). The core elements
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were extended through use of Scheme and Type qualifiers, which faciltiated description
through existing standards (e.g., thesauri of object and monument types).
Data standards, in accepted or draft form, are evolving to better handle huge
complex data sets and to effectively link archives around the world, however, Eiteljorg
(1997) highlights the difficulties inherent in managing electronic archives (cf. Wise and
Richards 2001). Collections of objects and hard copy records are often kept reasonably
well long term but electronic data presents serious hurdles. The collections were
created others, using idiosyncratic methods and forms, and the contents are disparate
with files including text, databases, images, CAD files, and GIS files. Eitlejorg notes that
storage is easy compared to making the electronic archive accessible over an extended
period of time. Data migration is a constant, and if accessibility is to be maintained,
electronic files must be routinely upgraded to current software and hardware standards.
Data transformation is problematic, though technically straightforward, because of the
complexity of archaeological data. Migrating an archaeological database, unlike for
instance CAD files, requires intimate knowledge of archaeological method and theory.
The data categories are seldom as obvious as creators think and datum points must be
routinely specified. Documentation is crucial for effective use and migration strategies.
The social contexts of archaeological research, whether in practical realms of
funding and legal agreements or in the shifting ground of accepted method and theory,
are important considerations in the development of electronic archives. Eiteljorg’s
(1997) article was written as he was managing the Archaeological Data Archive Project
(ADAP) at Bryn Mawr University in the United States. From 1997-2003 ADAP was a
developing model for electronic archiving. At the World Archaeology Congress, June
21-26, 2003, in Washington, D.C., Eiteljorg reported that ADAP was dead because
archaeologists would not submit their data to the archive. ADAP was terminated
because it was not economically viable, even though it had initial support through the
Archaeological Institute of America, the American Anthropological Association, and the
Society for American Archaeology. Eiteljorg framed his discussion by asking whether
archival preservation of digital information was a reasonable expectation in the United
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States. He went on to speculate that a major issue for the demise of ADAP was the lack
of computer sophistication and computer training for U.S. scholars. Another issue it
would seem would be the lack of secure, ongoing funding directed by State and Federal
mandate for preservation of electronic data. Archaeological resource management in
the United States is a very different research context than that described for the United
Kingdom.
Databases: Research and CommunicationDatabases are digital collections. These are the computer equivalent of the
traditional object collections in museums and the records and provenience information
stored in archives. Computer databases, if designed correctly, bring objects and
documents and research records into a single, protected but accessible area where
users can manipulate authenticated data (cf. Ferguson and Murray 1997; Flecker 2002).
Database management systems required the researcher to apply systematic
categories and criteria in consistent ways to research a subject. Consistent categories
allow transparent communication and discussion. Data models are used to guide the
progression from data capture to data analysis to open dissemination. Creation of these
data models require explicit refinement of traditional archaeological theory and method
(e.g., Hadizlacos and Stoumbou 1995). Fields and measurements recorded are
conditioned by the researchers’ interests as these are guided by the larger perspectives
of the discipline. Bader (2000) declares firmly that any database application working
with a two- or three-dimensional visualization tool like GIS enables transparent research
and the promise for open communication. For Bader and other database designers and
users, effective database management is a key to making dramatic strides in
archaeological research and in communication and education (cf. Yang 1986).
Today’s computer-driven research is making significance strides but there is a major
hurdle evident in the day-to-day work of archaeologists, revolving around the computer
sophistication of archaeological producers and users (cf. Andresen and Madsen 1996;
Campana and Crabtree 1987; Desse and Chaix 1986; Harland et al. 2003; Johnson
1997; Lohse 1996; Lohse and Sammons 1998; Powesland, Clemence and Lyall 1998;
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Rulf 1993; Ryan and van Leusen 2002; Winder 1994). Regional or national database
collections are usually supported by IT teams but primary data is still produced
principally by individual researchers with widely varying approaches, research
questions, and expertise. Most of these archaeologists are not programmers nor data
designers, they simply are using readily available, easy to use relational database
management systems like dBase for Windows, Paradox, or Access. These products are
usable in similar ways and data tables can be moved from one system to another
through dBase files or ASCII delimited files. There are complications in data
transformation and migration but most data producers and users operate above these
concerns.
Data models are the singular requirement in developing any database. A researcher
who wants to enter data must have designated a field. The fields are used to
systematically capture the data. The data captured is directly related to the research
question defined. Some fields are standard expectations, the kind of information all
archaeologists are expected to gather (e.d., site location, description, collector, level,
etc.). Other fields are unique to the methodology employed by the particular researcher
pursuing specific research questions. The field chosen will channel and limit and all
subsequent analysis. As Bader (1997) notes, it is commonplace still for researchers to
neglect defining a data model or identifying appropriate fields before they start gathering
data.
Data Transformation
Data analysis requires checking for errors, often using descriptive statistical
analyses and visualization techniques. These can also be used to transform raw data
into analytical data (cf. Fletcher and Lock 1991). For example, ordinal data can be
transformed into interval data using normalization. Interval data can be placed in fewer
intervals or to presence: absence categories. Factor analysis and cluster analysis are
common approaches to data transformation. Different statistical techniques will also
need transformations to produce different data characteristics. All transformations will
insert varying levels of bias but cannot be avoided, since data must be prepared for
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subsequent analyses and for use of multivariate statistics like factor and cluster
analysis, Bayesian classification or construction of neural networks.
Commercial database packages are available to run data transformations. DBASE is
still a standard choice combined with various statistical packages like SPSS or
WinState. Even database programming is becoming simpler as with the Delphi
software package that is becoming increasingly popular for computer literate
archaeologists.
Data Comparison
Researchers will inevitably want to run comparisons between their data and that
constructed by others. Too often these comparisons generate debate without reference
to the underlying data models or the use of variable analytical techniques. Use of
shared databases enable archaeological discussions to move beyond opinion and into
the realm of actual data comparison. The prerequisite is definition of the data model and
effective capture of raw data.
Comparing two different relational database management systems will begin with
comparison of their field structures and table structures. The comparable data
categories can then be arranged in a common database model. Next, criteria lists are
developed for each data category, transforming these into a common criteria list with
the least raw data loss possible. Common data tables are then transformable into
analytical data through solutions developed by the cooperating researchers. One result
can be two different analytical data sets as well as a common shared data set. The
discussion again settles on proper filtering and transforming of data. Data table
comparison can be a tedious exercise but development of common platforms or
analytical tools like the Bonn Seriation Package may accelerate easy data comparisons.
Great potential is also presented in use of images in databases, which negates much of
the tedious discussion centering on accepted descriptors or scales of measurement.
Knowledge Representation: Expert System/AI DatabasesDevelopment of optimal knowledge representation is a productive venue for
maximizing data use (Adaptive Intelligent Systems 2003). Davis, Shrobe and Szolovits
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(1993) describe five very important and distinctive roles for knowledge representation.
KR is a surrogate for the thing itself. It is a set of special commitments. It is a
fragmentary theory of intelligent reasoning in three components: representational
thinking; sets of inferences representing different sanctions; and sets of recommended
inferences. It is a medium for pragmatic efficient computation, guiding how information
is organized to maximize effective inference. It is an actual medium of human
expression, constituting a language for describing the world.
These KR roles provide the framework for data characterizations. This framework
drives realization that data capture must strive to represent maximum richness rather
than reducing complexity to arbitrary, truncated categories lending only sparse,
incomplete and inconsequential description. Richer data captures per force will feed
stronger logical inferences. Enhanced KR frameworks will require elaborated KR
technologies to be developed, including logical rules, frames, and semantic nets.
Representational thinking revolves around a fundamental observation: the intelligent
observor who wishes to make sense of the world needs to acknowledge that reasoning
is an internal process while the things reasoned about exist only externally. Neustupny
(1992) identifies this juxtaposition in describing how archaeologists can define data only
within a theoretical framework or knowledge base that then channels how information
flows are constructed. Researchers don’t find data, they may not even recover data.
They direct data capture based on categories established by their research interest
conditioned by accepted theoretical and methodological positions accepted within their
research field. To improve capture systems, we must accept the KR charge that we
enrich our capture nets to better reflect the complexities of our study domains.
This dichotomy between the researcher’s mind and the world observed is the
fundamental rationale and role for knowledge representation. Reasoning is seen as a
surrogate for external actions. Questions revolve around the identity of the surrogate or
what it is a substitute for and also the fidelity of the surrogate or what it includes and
what it omits. Inevitably, we must acknowledge that the only completely accurate
representation of any object is the object itself. Any representation short of this ideal is
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incomplete and must be explicitly defined and documented. By extension, we can argue
that the more imperfect the surrogate, the more imperfect the inferences drawn. All
surrogates must constitute distortions to some degree. Any description of the
archaeological object is a reflection of our own contemporary thinking, with
representations functioning only as surrogates for abstract notions of action, process,
belief, causality, and categorization. Enriching data capture models insulates our
research against an overriding truthful observation: the soundest reasoning will not
avoid reaching wrong conclusions about our study domain. All representations, logically,
are imperfect, and as such, lead to inevitable error. Good or best representations are
those that minimize errors and good data models are those that emphasize as complete
and representational a description as is theoretically and methodologically possible.
Knowledge representations are sets of ontological commitments. These reflect the
imperfect nature of representations of reality but act to focus attention on selected
features, characteristics or general descriptions that are seen to be useful by a
particular discipline. Different task domains inevitably build different ontologies. These
ontologies are written in different languages and reflect different theoretical and
methodological foundations. The ontological commitments made begin at the level of
the representation technologies and accrue at higher levels. Additional layers of
commitment are added as the technology is applied. This constitutes the application of
the constructed knowledge base. Layers and hierarchies are integral. The ontological
questions are fundamental to the construction and application of this knowledge base.
At each layer the choices made are about representations and not data structures. For
example, a semantic net is a representation but a graph is a data structure. One simply
implements the other. Every representation must be implemented in the computer by a
data structure.
A useful perspective is presented in Minsky’s (1974) description of frame theory. The
intelligent actor confronted with a new situation selects the frame from memory. A
remembered frame is adapted to fit reality by the selective changing of details. The
frame is simply a stereotyped situation that supplied context for resolvable, directed
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actions. Frames are used by archaeologists as elements of classification, whether
types, stages, phases or narrative conventions. These frames are then defined as fields
in computer analyses, and guide decision making on the categorization or chopping of
data in the capture process.
Designers construct representations that offer a set of ideas about how to organize
information in ways that facilitate the inferences. For instance, in frame theory, any
frame will have attached to it several types of information. Frames are then used to
organize information, mirroring the thinking of the researchers. Stone projectile point
types, produced in the computer system as digital images, serve as frames with linked
information. These same frames or types can then be constructed as taxonomic
hierarchies with accompanying taxonomic reasoning and inference execution.
Obviously, representation and reasoning are inextricably intertwined. Building a
comprehensive knowledge base will require use of accepted representations. However,
the more creative aspect of database building and of data extraction involves designing
systems that will feed innovative and intuitive use of the data. Advances will be made
when new, more efficient representations are defined to reflect application of new
technological, theoretical and methodological developments.
AI in Archaeology
Van den Dries (1998:13-17) offers one of the few summaries of knowledge-based
applications developed for archaeology. He notes that archaeologists have been
interested in developing expert systems since the early 1970s (cf. Doran 1974, 1977;
Doran and Hodson 1975: 309-316; Lagrange and Vitali 1992). Expert systems have
been accepted as amplifying knowledge transmission (e.g., Ennals and Brough 1982)
and for instruction (van den Dries 1998). They have also been developed for improving
theoretical and methodological research (Francfort 1990; Gardin et al. 1988; Lagrange
and Renaud 1985;).
Expert systems in archaeology have been principally a means of formalizing and
modeling knowledge molded by theories and methods. They are used to evaluate
hypotheses, classify artifacts, predict site locations, standardize analytical frameworks,
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and run simulations on archaeological problem areas. Van Den Dries (1998) extends
their use into teaching and knowledge transmission. It is important to note that experts
may construct such systems to develop and apply expertise, but the non-expert may
benefit in using them for consultation and communication.
Interpretive Context
Science, in itself, constructs mental maps. A goal of science is to explain the natural
world, ranging from simple causality to elaborate chains of explanation. One powerful
approach is reductionist, with its focus on internal structure: laws of motion, law of
gravity, laws of aerodynamics. The result are general principles that interpret complex
phenomena. Reductionism presents a clean cognitive map with meta-features and
carefully defined layers of escalating or descending complexity. Another powerful
approach is contextualist, where the view shifts from internal to external. For example,
what external constraints molded the object under examination. Archaeological
classification can be exceedingly reductionist. We draw up types based on morphology
for instance, or correlate morphological types with chronological layers. This type of
approach negates any explicit tie with prehistoric cognitive maps, and instead, is simply
a handy means of heuristic classification. This is comparable to John Searle’s thought
experiment of the “Chinese Room,” wherein a person seeking to understand Chinese
manipulates huge stacks of paper according to rigid pre-prepared instructions.
Questions in Chinese come in from the outside, pieces of paper get moved around, and
an answer in Chinese will eventually go back out. Yet, we know the person cannot
speak Chinese, so we have to assume that real intelligence cannot be reduced simply
to a set of underlying rules. The experiment rests, of course, on a false analogy. A
proper inference would be that the entire room, rules, paper-pusher, etc., is analogous
to a person who understands Chinese. The person in the room would be analogous to
one nerve cell in a Chinese speaker’s brain. According to Stewart and Cohen (1997:
180), since the room can carry on Chinese conversations flawlessly, the whole system
must be held to “understand” Chinese (analogue for that system or understanding in the
individual). A major flaw in the Searle mind experiment is that the fact that something is
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possible in principle, is much less informative than the fact that it is impossible in
practice (Dennett 1991). For example, the instructions on paper would have to contain
contingency plans for every possible Chinese question. They cannot simply be a huge
catalog of questions and answers, no room would be large enough and no scheme
could be far reaching enough. The rules for moving the paper would have to be devised
by a fully fluent master of Chinese.
The “Chinese Room” metaphor warns us that logically developed classification
systems, databases, and retrieval systems can establish types of objects and create
solid statistical bases for discrimination but these do not inform us about their prehistoric
makers. As analysts, we must attempt to place artifacts into their contexts of design,
manufacture, use and re-use. The artifact forms should be viewed as constituting
mental templates that have embedded meaning related to cultural mores, standards,
economic decisions, and adaptive strategies.
Knowledge Elicitation
Creation of any knowledge-based application requires a trajectory of knowledge
elicitation, analysis, modeling, and application design. The first and critical step is
extraction of expert knowledge (cf. Burge 2003; Kidd 1987; Ford and Sterman 1997).
The designer must initiate a full analysis of the problem domain and of the knowledge
base required to develop an expert system that can perform a specific task successfully.
Once the knowledge base has been constructed, a model can be made for subsequent
design.
Designers have found that experts release an idealized view of their work (Payne
and McArthur 1990). They implicitly emphasize ideal and clear situations and overlook
problem scenarios. This lends a biased view, not fully representative of real world
situations.
Van den Dries (1998:44-51) reviews difficulties encountered in eliciting expert
knowledge for construction of WAVES-WARP, an expert system for lithic use-wear
analysis. van den Dries reports that information was unbalanced and often insufficiently
detailed, consisting predominantly of data on wear patterns that were considered
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diagnostic and under representing deviations from these ideal patterns. This tendency
was particularly pronounced if working from published sources rather than in interviews
with experts. There were also gaps in different expert’s knowledge and inevitable
problems of cross-referencing different approaches and decision-making structures.
Experts’ transmission of knowledge is also complicated by formal training (facts and
theories) and their own subjected rules-of-thumb gained by experience.
The knowledge engineer (extractor) needs to construct systematic information in the
format: “If you observe wear attributes A, B and C then this is an indication with
certainty X that this tool was used in activity D or E, and not in activity F, because ....”
As van den Dries (1998:45) concludes, lack of complete logical constructions from
experts is due to practical factors: these are typically not required in reports of results
and because use-wear types or categories are not clear-cut, frequently grading one into
the other. This means that for most analysts, interpretation does not always occur within
the absolute structure of formal rules but as the result of complex sets of associations.
Knowledge Handling
Once acquisition of knowledge has been accomplished, and summarized in a formal
model, a conceptual map is made of what the application is going to look like, how tasks
will be carried out, how knowledge will be represented, the nature of inference
mechanisms, and what other aspects of transmission will be built in. Different types of
programming can be used, including linear programming, rapid prototyping, and
incremental programming. In linear programming, the application is implemented and
evaluated as a complete product. A limitation is that users are not integral to the full
development process and late discovery may reveal significant problems requiring fixes.
Prototyping necessitates longer development but systematically and efficiently utilizes
user input and patterned fixes (cf. Bratko 1989; Hayes-Roth et al. 1983; Kahn and
Brauer 1989; Whipp and Lewis 1989). Both programming approaches are combined in
incremental programming, wherein the system is divided into smaller parts, tasks or
modules and each of these is implemented in the linear method and evaluated through
prototyping. This has advantages: design can be quickly and efficiently updated, users
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are involved constantly, and the resulting prototype has been significantly debugged (cf.
Hollnagel 1989).
Directionality, key to productive analysis, is keyed to problem solving within
patterned cultural perceptions. Large complex problems will routinely be broken down
into smaller less complex problems more amenable to resolution through use of
practiced activity chains or programmed responses. Segal (1994:25-26) asserts that
any analysis of problem solving has four components: identify the problem space as
that range between the initial and goal states (Newell and Simon 1972); identify
intermediate states between the initial and goal states (only trivial problems will allow
direct movement from the initial state to the goal state); identify what needs to be done
(movements as transformations); identify the resources (knowledge, skills, material,
time) needed to execute each move. Directionality is achieved/defined by tracking
moves from stage to stage.
Effective knowledge handling is measured as representational adequacy,
correctness, modularity and simplicity. Assessment of the user interfaces attached
involve measures of graphical possibilities, user friendliness and explanatory facilities.
All design decisions will be measured for flexibility, transparency and ease of
maintenance. In general, all knowledge handling systems should strive to be fully
representative of the extant knowledge base, and they should allow easy maintenance
of the constructed knowledge base. A modular approach is often the best solution,
dividing knowledge into orderly, coherent chunks. The structure must be transparent
with detailed data descriptions to ensure coherent use and ready upgradability.
Overriding all design is that the system be made as simple as possible. That the system
adhere to correctness is inescapable. It must exhibit all required reasoning facilities to
initiate and complete routine tasks.
WAVES and WARP
Van Gijn and Fullgar (1998:203-207) welcome van den Dries’ work on WAVES in an
addendum to his ground-breaking monograph (van den Dries 1998). They admonish
that the primary thing missing in lithic use-wear analysis has been a definitive key for
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assessing stone tool function accepted by all analysts. In lieu of this key, analysts have
developed different systems for recording and interpreting microscopic observations.
Variable importance is then attached to different characteristics: scarring, striations,
polish, beveling and rounding of surfaces. Analysts also enter myriad descriptive
attributes, ranging from generally accepted standard terms to quite ideosynchratic
constructions: melting snowfield and comet tails. Van den Dries offers expert systems
as a means of formalizing and structuring the data capture and transmission process.
WAVES (Wear Analysing and Visualising Expert System) was developed to analyze
use-wear traces on flint implements. WARP is an associated prototype based in neural
networks. Van den Dries (1998) summarizes testing of both prototypes, assessing their
relative qualities under comparable constraints. WAVES was tested twice, with
evaluation by four analysts, with outcomes compared to other “blind tests.”
WAVES models expert knowledge development. The aim was two-fold: to
successfully standardize the knowledge acquisition and application process and to
refine the methodology of use-wear analysis. van den Dries (1998:43) reports that
collecting and analyzing expert knowledge revealed that training of apprentices involved
two levels: basic and advanced. Basic focuses on teaching methodological principles
and guiding analysis. Advanced students reach autonomous interpretations and are
more interested in verification. Hypothesis verification was seen to be a principle
concern. van den Dries assumed that the WAVES application should be divided into two
independent components: analysis and hypothesis validation. Of course, boundaries
between the two stages are often fuzzy. In each phase of analysis the work from the
previous phase is modified and refined and all ensuing steps condition decision-making
on the part of the analyst.
WAVES is a rule-driven expert system, depending upon IF-THEN decision rules
rather than on propositional logic, semantic nets or frames. van den Dries (1998:52)
asserts that rule-driven decision making matches the conduct of lithic use-wear
research best, and that it lent to simplicity and modularity of system design. Correctness
was insured by confining WAVES to connecting a wear pattern to a specific material or
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motion is the observed features matched the motion exactly. Non-matching features,
not seen previously, are excluded.
WAVES user interface was designed to include graphics and be highly interactive
with attractive, intuitive screens. Built in, are facilities to guide information input and
provide additional user support. Information on internal procedures was also made
transparent. On request, a user is informed how and why certain facilities had to be
incorporated, why a conclusion was drawn and why not. Rules active at a particular
stage of the reasoning process are shown, and those activated next are indicated.
Large collections of use-wear photos are included to support description of traces and
to support interpretations resulting from the analytical procedures.
WAVES seems to make significant strides over Grace’s (1989) pioneering expert
system in lithic use-wear analysis, FAST (Functional Analysis of Stone Tools). FAST
like WAVES was designed to facilitate training students. The two are very different in
basic design. FAST was developed for functional analysis of entire stone tools. WAVES
was built to focus on interpretation of use-wear traces. van den Dries (1998:77) asserts
that because WAVES does not focus on gross morphology, it is more applicable to
analysis of a wider range of tool uses in different materials and across cultural periods.
Further, FAST produces an interpretation as one final answer, where WAVES
introduces all appropriate complexity to the student user, and includes an analytical and
a hypothesis validating procedure.
Van den Dries (1998) included development of a neural network prototype called
WARP. The neural network can handle more complex bits of data, involving unknowns.
Neural networks are increasingly used in industrial, medical and other fields involving
many practical and time-consuming redundant tasks like classification, pattern
recognition and prediction. Neural nets effectively learn, by means of mathematical
models that predict outcomes of complex situations by generalizing from similar,
previous situations. The neural agent must be trained by entering lots and lots of
information and running autonomous searchers for non-linear relationships between
variables. It learns to select important variables and disregard others. Neural networks
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have a very different architecture from expert systems, use specific knowledge storing
and processing methods and are applicable to different study domains (cf. Gibson 1992:
265; 1996). Van den Dries’ (1998) WARP was developed to investigate the possibilities
and difficulties of formalizing and modeling expert knowledge involved in use-wear
analyses by means of a neural network. The findings were compared with those
generated from development of WAVES. It was found that WARP was easier to handle
and to understand. Users found interfaces highly intuitive and the necessary user
learning curves were much less than for the expert system WAVES. Van den Dries
(1998:90-91) also concluded that WARP produced comparable analytical results with
the added advantage of dealing with previously unclassified or unknown features.
These could be used to guide future research. A profound difficulty in using the neural
network centered on the neural agent having difficulty being trained in introduction of
complex datasets. Too many contradictory facts led to many stumbling points in
successful training. A lack of validation for answers and the autonomous character of
the neural agent were also phrased as possible drawbacks.
SIGGI-AACS
SIGGI-AACS represents a significant step beyond WARP-WAVES in use of a neural
network to develop both an automated classification system and an authoritative online
database (Lohse et al. 2003). Past experiments with AI systems have largely been
confined to rule-based forced classifications as in that developed by van den Dries
(1998) for teaching use-wear analysts. Use of a sophisticated neural network that is
trainable and capable of making novel intelligent decisions is an important approach to
improving information sharing and exploring theoretical tenets of archaeological
classification and data design.
SIGGI-AACS is a working prototype for online classification of stone projectile
points in a neural network. The initial application uses specimens drawn from the North
American Pacific Northwest cultural area but the system is extensible. The current
database design is not software specific and was initially done in Microsoft Access. The
autoclassification system consists of three interrelated products. Product 1 is the
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classification system, with software that allows users to submit images of artifacts or
actual specimens to be digitized. This stage generates projectile point classifications
with specimens assigned to recognized types and is a .NET standalone application.
Product 2 consists of release of a typological descriptive report to system users,
including a full image inventory of submitted and classified specimens with attached
statistical probabilities of type assignment. Product 3 is a web-based educational venue
for public access and study. SIGGI functions as a virtual analyst, which given some
basic rules and concepts, is trained by introduction of new data sets. To improve its
accuracy, SIGGI must be continually exposed to new and amplifying data fields. SIGGI
is capable of accurately applying extant projectile point typologies; however, SIGGI can
also identify outliers or unique data sets and suggest that these represent new types or
that previous analysis identifying types needs modification within new explicit data
ranges. As with any student, we must be certain that the data we ask SIGGI to analyze
has been authenticated, and that we gather samples that are clearly representative of
defined research populations. Because SIGGI learns by mimicking expert’s decisions,
behaviors, and explicit rules, and then creates new decision frameworks integral to the
compilation of new data, SIGGI eventually may generate insights into decisions made
by human analysts and by prehistoric makers.
The principal barrier to training SIGGI is to retrieve collections that have fine
excavation and analytical context. A primary assumption in archaeological typologies is
that the knappers of the stone points were operating within a very well defined cultural
model that laid out clear expectations regarding what a particular projectile point form
should look like. This working assumption is borne out in the clear temporal and spatial
separation of populations of projectile points (e.g., Lohse 1985). Essential for training
this virtual analyst are retrieval of sample populations that as nearly as possible
represent these real time actors in the past. For example, for training SIGGI needs
projectile point samples that were found in large numbers on a single site, within a
specific layer, in association with cultural features representing clear prehistoric human
activity, and bracketed by good reliable radiocarbon dates. These samples supply the
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virtual analyst with numerous points made to a prehistoric standard, and reveal
expected ranges of statistical variation in basic variables of form. This allows SIGGI to
make intelligent decisions on where to draw lines demarcating the distinctive types of
projectile points. SIGGI’s ability to explicitly handle multiple variables in a
multidimensional statistical environment promises insights into clarification and
refinement of chronologies of prehistoric projectile point types, a result of considerable
interest to the practicing archaeologist (cf. Lohse et al. 2003).
The current SIGGI-AACS Project has focused on obtaining authenticated data in an
effort to produce a “clean” set of data that reproduces exactly the classification
published by Lohse (1985). Data collected are stored in an image database with
attached descriptive fields. SIGGI is in a sense, Lohse’s virtual brain. Since SIGGI
represents the thinking of only one archaeologist, future work intends to extract
knowledge from other archaeological typologists. SIGGI can “think” like Lohse, who
summarized previous typological work, but the project is expanding and will have SIGGI
interact with other researchers’ ideas, i.e. bring SIGGI an education from the larger
community. This reflective activity is one of the more important aspects of the project.
Obviously, certain kinds of things can be classified in proscribed ways, but project
research focuses on identifying WHY things should be classified in certain ways. By
watching SIGGI make classifications, these researchers hope to gain a better
understanding of why archaeologists make classifications and how these might be
continually improved as research methodology improves.
The accuracy of classification provided by SIGGI depends on a large authenticated
knowledge base. The SIGGI database performs several functions that influence both
the performance of SIGGI and the sharing of data among researchers. At a minimum,
SIGGI-AACS is required to (1) store images; (2) store locations, (3) store
characteristics, and (4) keep information secure.
SIGGI also allows for improved research collaboration. Using the underlying SIGGI-
AACS research database, many researchers can maintain information about many
collections on-line. Each researcher is able to maintain complete ownership of access to
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his own material. This allows research bridges to be built while maintaining the unique
identity of each research collection. When fully implemented, the system can maintain
collections of many types and provide neural network analytic services where
appropriate.
A crucial aspect of the SIGGI-AACS project is how users will access and input
information on the Internet. Four major user groups have been identified: government
agencies, researchers, Native Americans, and the general public. Tasks have also been
identified that will be requested by each of these user groups.
A primary user of SIGGI-AACS should be federal and state land-management
agencies (e.g., USDA Forest Service, USDI Bureau of Land Management, National
Park Service). Agency users will be interested in the automated typology made possible
by SIGGI’s neural network. Three major tasks include analysis of point images
submitted, data storage, and summative transfers of information.
For Task 1, the web site contains appropriate interfaces to allow the agency (or a
SIGGI-AACS staff member) to enter an image of the projectile point for automatic type
assignment. This site allows the user to progress through the different stages of image
acquisition, manipulation, and analysis. At each point in this image manipulation
process, the user must be able to check the image and authorize its movement to the
next stage. Once the image has been successfully entered, SIGGI will analyze it and
return the appropriate typological assignment. At the same time (and out of the user’s
view), SIGGI will also encode the relevant datapoints (size and shape indicators), and
file the datapoints, image, and typological, locational, and temporal information into the
SIGGI-AACS database. In Task 2, the agency user is able to access information which
is already in the database and for which that agency has statutory responsibility. In this
case, the web site provides an interface by which the government agency can request
images, specimen or inventory numbers, counts, chronologies, charts, graphs, or maps
displaying information about specific projectile points. In Task 3, the web site provides
interfaces for the agency to request similar, but summative, information for projectile
points not within their statutory responsibility.
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Researchers are interested in the automatic typology made possible by SIGGI’s
neural network, but also need to access information from the database for specific
projectile points, including images but perhaps excluding locational data. For Tasks 1-3,
the web interface is the same as that set for government agencies. For Task 4, the
interface must also allow the user to request information about specific projectile
point(s). For example, a researcher may request images of points from the type site or
of a recent find. Providing this type of specific information to archaeologists advances
the resolution of study, adding chronology, spatial distribution, functional studies, or
symbolic studies. However, locational information would be excepted: academic or
contract archaeologists cannot be given exact locations for artifacts without permission
from the federal, state, or tribal landowner.
The third profiled user group are Native American tribes and First Nations in the
United States and Canada. SIGGI-AACS, with its chronological and spatial data, may
have profound implications regarding cultural affinity issues, and tribes may be
interested in this information for both heritage and legal reasons. Tribes may be able to
use the data stored in SIGGI-AACS to argue for traditional use of land or rivers not
currently within the tribes’ legally recognized authority. In addition, tribes and first
nations may wish to use the projectile point database as a mechanism for storing
cultural heritage information and to provide that information in educational contexts
(tribal museums, schools, etc). Security will be a major issue, and United States federal
law requires that locations of archaeological sites not be made available to the general
public. A fifth tasks is added for these users: the imposition of secure access controls.
The fourth major user group for SIGG-AACS are members of the public. These
users will ask such questions as, “I found a point. What type is it?” “Where are these
points found?” and “How old is it?” They may also be interested in images of projectiles
in the database, perhaps to compare with a point in their own possession or to copy into
a school report. The materials provided to these users will be the result of scripted
actions and not the result of active database searchers.
Implications for Future Developments
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WAVES-WARP and SIGGI-AACS projects, while still in the prototype phase, provide
innumerable examples illustrating fundamentals of database design, user interface
design, and relational database design. Both operate on multiple levels, from
development of an explicit statistically based online classification system with attached
database, to use of an electronic or virtual agent to augment archaeological training in
classification, to observation of an artificial agent to study the character and
effectiveness of archaeological thinking. Anthropologists and archaeologists are
beginning to join cognitive psychologists and learning theorists in the use of artificial
intelligence systems to explore human thought and behavior (e.g., Baylor 2002; Conte
and Castelfranchi 1995; Cumming 1998; Doran various; Epstein and Axtell 1996;
Gonzalez and DesJardins 2002; Russell and Norvig 1995; Woolridge and Jennings
1998; Woolridge, Muller and Tambe 1996).
Although others have used neural networks in archaeology, WAVES-WARP and
SIGGI-AACS are partially successful prototypes in archaeological information
technology. Key now is to expand on these prototypes and authenticate their potential
(cf. Stead 2003). Obvious productive spinoffs from this research include: (1) training of
an online neural classification system capable of accurately identifying archaeological
artifacts (SIGGI in this sense constitutes a highly interactive user interface sitting atop a
secure database); (2) creation of new theoretical and methodological frameworks to
accelerate effective information design; (WAVES and SIGGI offer advantages in
teaching and insights into how we conceive of our study domains); (3) further
development of artificial intelligence systems linked to giant heritage databases that are
constantly maintained and revised to ensure secure storage, organization and transfer
of our archaeological heritage.
Construction of large databases supervised by intelligent agents is a completely
attainable, realistic projection not just for archaeology but for all information heavy, data
rich disciplines (e.g., Egenhofer 2002; Farenc et al. 2000; Thalmann, Farenc and Boulic
1999; The Semantic Web 2003; Tsukii, Kihara and Ugawa 2001). This is a major break
from past practice in archaeology: where laborious searches in libraries and archives
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for hard-to-find publications and “gray literature” was the norm; where tedious and time-
consuming requests are made to overworked archive and collections managers to
hand-relate various hard copy finder’s guides in order to find and pull specimens from
cabinet drawers and storage boxes (cf. Huggett 1995; Lock 1995; Lock and Brown
2000; Madsen 2001; Pinto et al. 2001; Stewart 1996). The vision that information can be
accessed through a central portal and seamlessly indexed and sorted dependent upon
researcher interest and creative motivation constitutes a paradigm shift in
archaeological information management very like that declared for e-publishing by
Morton (1997), fueled by a shared ideology steeped in IT (cf. Ginsparg 1996; Odlyzko
1996). An affirmation of technology has taken place and is driving significant changes in
the infrastructure of scientific research (cf. Dreyfus 2001; Dreyfus 2002; Dreyfus and
Dreyfus 2002; Hodder 1999; Neustupny 1992). Use of the Internet for delivery of
scientific information not only speeds access but forces changes in the social
organization of scholarship and the authentication of information (cf. Fulda 2000; Gray
and Walford 1999; Holmen et al. 2003; Lamprell et al. 1995; Miller, Dawson and Perkins
2002; van Leusen et al. 1996). New kinds of interfaces will be developed that sit atop
these huge heritage databases, ensuring that users have virtually seamless interaction
with data, whether through virtual documents or virtual agents (Gruber, Vemuri and Rice
2003; Miller 2000; Ryan 1995). GIS is still the backbone for many archaeological data
applications, and innovative uses of maps to transmit information is yet another form of
enhanced interface produced in Ian Johnson’s impressive TimeMap Project (e.g.,
Johnson 1999, 2002a, 2002b, 2003 ( see also Lancaster and Bodenhammer 2002 on
the Electronic Cultural Atlas Initiative). Virtual Reality applications also have tremendous
potential in transferring information as 3-D data (e.g., Pringle and Moulding 1997;
Razdan et al. 2001, 2002).
We are not at our vision yet. Technology, in the form of hardware and software is
available, and we can do things today in manipulating huge data sets, that were
unthinkable a decade ago. Computers are increasing in power and our students have
an underpinning in IT that readies them to join our vision for the future. The principle
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problem lies in social informatics, in understanding how our discipline has assembled
data and conveyed information. Standards are in place that gauge scholarly contribution
and data integrity, and some of these will have to fall away to accept the shared vision
of IT applications across the board.
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