linked data in practice
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Linked Data in PracticeOregon Digital Linked Data Workshop, Eugene OregonNovember 25, 2013
Karen Estlundkestlund@uoregon.edu
The Promise of the Semantic Web
I have a dream for the Web [in which computers] become capable of analyzing all the data on the Web – the content, links, and transactions between people and computers.
— Tim Berners-Lee, 1999
Why now?
grufnik, http://www.flickr.com/photos/grufnik/298814187/, CC BY-NC-ND
Principles
1. You should not be constrained by your schema.
2. You are not that special. 3. You do not know everything. 4. If your data isn’t reusable, shareable, and
machine readable, then you’re not doing good enough.
5. Use exemplary behavior and reuse from others so that they may also reuse from you.
Metadata Schemas
Linked Data Vocabularies
Vocabularies Building upon Each Other
E.g. DarwinCore building on DublinCore
Self-contained Vocabularies
Comparing “Title”
● DataCite, Title○ A name or title by which a resource is known.
● DublinCore, Title○ A name given to the resource.
● MODS, Title○ A word, phrase, character, or group of characters
that constitutes the chief title of a resource (i.e. the title normally used when citing the resource).
● Open Graph, Title○ The title of your object as it should appear within
the graph.
Comparing “Title” Cont.
● VRA Core 4.0, Title○ The title or identifying phrase given to a Work or an
Image. For complex works or series the title may refer to a discrete component or unit within the larger entity (a print from a series, a panel from a fresco cycle, a building within a temple complex) or may identify only the larger entity itself. Record multiple titles in repeating instances of the ti tle element. Indicate the preferred title with pref ="true" and alternate titles with pref="false". For an Image record this category describes the specific view of the depicted Work or Collection, and corresponds to the CCO View Description.
Blank Node Example
<creator><creatorName>...</creatorName><nameIdentifier
nameIdentifierScheme=”...”schemeURI=”...”>...
</nameIdentifier></creator>
Blank Node RDF Graph
My Presentation
dcite:creator
Estlund, Karen
dcite:creatorName 951...
dcite:nameIdentifier
Linked Data Resources
Example from BBC News
LOD in HTML <head>
Example from Historic Oregon Newspapers
LOD at expected URL (e.g. ‘X.rdf’)
http://oregonnews.uoregon.edu/lccn/sn84022653/1897-05-01/ed-1/seq-5.rdf
Example from Oregon Digital Hydra
Expected file
http://hydra-dev.library.oregonstate.edu/catalog/oregondigital:41.nt
Authority in Linked Data
Interface Issues
Institution or Community?
Shoupiest, http://www.flickr.com/photos/shoupiest/4470852646/, CC BY-NC
Questions
?
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