1 herbert van de sompel cnri meeting june 28-29 2001 herbert van de sompel oren beit-arie [edited...

1 herbert van de sompel

CNRI meetingJune 28-29 2001

Herbert Van de SompelOren Beit-Arie

[edited version with revised terminology, as a result of discussions at the meeting – July 11th 2001]

NISO Committee AX (OpenURL)

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OpenURL framework fundamental goodies

open reference linking• gives users the freedom to decide where to obtain reference links from

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OpenURL framework fundamental goodies

open reference linking• gives users the freedom to decide where to obtain reference links from

OpenURL framework:• collaborative model:

• information providers introduce a hook;• hook is URL;• URL is there to deliver metadata and identifiers to service component.

• service component: • target of the URL;• provides services when user clicks URL; • user chooses service component.

• OpenURL: specification for the URL

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OpenURL specs fundamental goodies

Facilitates the delivery of metadata about a referenced item and about the context in which the item is referenced to a service component as a result of an explicit request

• by value delivery: metadata is on the OpenURL • by reference delivery: information is delivered on the OpenURL that allows the service component to fetch (additional) metadata

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OpenURL specs fundamental goodies

Facilitates the delivery of metadata about a referenced item and about the context in which the item is referenced to a service component as a result of an explicit request

• by value delivery: metadata is on the OpenURL • by reference delivery: information is delivered on the OpenURL that allows the service component to fetch (additional) metadata

Service component will provide contextualized services relating to the referenced item based on the delivered metadata• concrete behaviour/actions of the service component is not specified

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Motivation for Bison-Futé

Bison-Futé is about taking a step backwards in order to see the picture more clearly.

looking at contextual provision of services relating to referenced items without making assumptions that have been made in OpenURL framework & OpenURL specs

not l’art pour l’art: using the newly gained perspective to inform the OpenURL standardization process

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Motivation for Bison-Futé

OpenURL framework

OpenURL

choices/assumptions have been made

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Motivation for Bison-Futé

OpenURL framework

OpenURL

choices/assumptions have been made• referenced item is a scholarly work the terminology of the framework is specific for scholarly information environment the OpenURL specs are focused on scholarly environment

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Motivation for Bison-Futé

OpenURL framework

OpenURL

choices/assumptions have been made• 2 contextual entities the “source” (service providing OpenURL) service component

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Motivation for Bison-Futé

OpenURL framework

OpenURL

choices/assumptions have been made• way to reference the item: metadata-zone global-identifier-zone local-identifier-zone

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Motivation for Bison-Futé

OpenURL framework

OpenURL

choices/assumptions have been made• way to reference the 2 contextual entities: origin-description BASE-URL local-identifier-zone

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Motivation for Bison-Futé

OpenURL framework

OpenURL

choices/assumptions have been made• way to encode as URL name=value pairs target at service component

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Motivation for Bison-Futé

OpenURL framework

OpenURL

choices/assumptions have been made: scholarly domain within that domain:

the entities involved the way to reference entities the way to encode references to entities on a URL

Bison-Futé model

web

ContextObjectdescriptor

------------

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Remember

it is all about delivery of metadata

of the referenced item and of contextual entities

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Bison-Futé: ContextObject

• OpenURL makes choices regarding the entities that must be involved in the contextual provision of services• local-identifier-zone has been (ab)used for provision of contextual information that OpenURL does not explicitely support (service types)

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Bison-Futé: ContextObject

• OpenURL makes choices regarding the entities that must be involved in the contextual provision of services• private-identifier-zone has been (ab)used for provision of contextual information that OpenURL does not explicitely support (service types)

=> ContextObject

• the ContextObject is a construct that -- we think -- contains all entities that are required for the contextual provision of services

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referent referringentity

referrer

requester

resolver

ContextObject

serviceType

entity

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Bison-Futé: descriptor

• OpenURL makes choices regarding the way to reference the entities that are involved in the contextual provision of services• The way in which these references are made is different from entity to entity• local-identifier-zone has been used to reference entities in ways not supported by OpenURL

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Bison-Futé: descriptor

• OpenURL makes choices regarding the way to reference the entities that are involved in the contextual provision of services• The way in which these references are made is different from entity to entity• private-identifier-zone has been used to reference entities in ways not supported by OpenURL=> descriptor

• descriptor is a uniform construct tailored for referencing all entities involved in the contextual provision of services (we think)• descriptor serves the purpose of delivering identifiers and metadata of entities• descriptor builds on the “by value” and “by reference” concept of OpenURL

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referent referringentity

referrer

requester

resolver

ContextObject

descriptor

serviceType

entity

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A descriptor describes an entity by means of:

• entity-id• metadata-id• metadata-description• metadata-description-pointer• private-identifier

Bison-Futé: descriptor

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A descriptor describes an entity by means of:

• entity-id• NID & identifier that is unique in namespace identified by NID • doi & 10.1074/jbc.M004545200

• serves 2 purposes:• delivery of identifier = first class citizen • identifier can be a key to access metadata (think CrossRef)• by value & by reference

Bison-Futé: descriptor -- entity-id

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A descriptor describes an entity by means of:

• metadata-id• NID & identifier that is unique in namespace identified by NID • pmid & 10942764

• serves 2 purposes:• delivery of identifier of metadata description = first class citizen • identifier can be a key to access metadata (think PubMed)• by value & by reference

Bison-Futé: descriptor -- metadata-id

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A descriptor describes an entity by means of:

• metadata-description• MFTID & metadata description rendered according to the format identified by MFTID• PubMedSGML & record formated according to PubMedSGML

• serves purpose:• delivery of metadata description• by value

Bison-Futé: descriptor -- metadata-description

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A descriptor describes an entity by means of:

• metadata-description-pointer• MFTID & explicit pointer to metadata description rendered according to the format identified by MFTID• PubMedSGML & URL pointing at record formated according to PubMedSGML

• serves purpose:• delivery of metadata description• by reference

Bison-Futé: descriptor -- metadata-description-pointer

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A descriptor delivers metadata by value & by reference:

• by value:• entity-id• metadata-id• metadata-description

• by reference:• no intelligence required to get to metadata

• metadata-description-pointer• intelligence required to get to metadata:

• entity-id• metadata-id

Bison-Futé: descriptor

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ContextObject

descriptor

entity-idmetadata-idmetadata-descmetadata-desc-ptrprivate-zone

referent resolverreferrerreferring entityrequester serviceType

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reference to referent serviceclosed link

click

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referentresolverrequesterreferring entityreferrerserviceTypeprivate zone

ContextObjectencoding

OpenResolutionLink

reference to referent

descriptor

service ....s

encoding

resolver

click

resolves referent’s descriptor into

services

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OpenURL standardization & Bison-Futé

• use Bison-Futé for its concepts only, as inspiration for the standardization process• get real ! By elimination: use only those parts of Bison-Futé that are essential for making fast progress in the core area (open reference linking)

Within the core area apply a phased approach• 1st: encoding scheme for simple OpenURL’s (meaning of simple to be defined)• 2nd: encoding scheme for complex OpenURL’s (meaning of complex to be defined)

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Example of procedure

Simple OpenURL’s: • only 1 referent• only use certain entities of ContextObject• only use certain parts of descriptors to describe entities• only certain namespaces• only certain metadataformats

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ContextObject descriptory/n # id mid mdesc mdescpt mpid

referentresolverreferrerreferring erequesterserviceType

Example of procedure

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ContextObject descriptory/n # id mid mdesc mdescpt mpid

referent y 1resolver y 1referrer y 1referring e y 1requester n 0serviceType y 1

Example of procedure

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ContextObject descriptory/n # id mid mdesc mdescpt mpid

referent y 1 y y y y yresolver y 1 y -- -- -- --referrer y 1 y -- -- -- --referring e y 1 y -- -- -- --requester n 0 -- -- -- -- --serviceType y 1 y -- -- -- --

Example of procedure

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OpenURL ContextObject descriptory/n # id mid mdesc mdescpt mpid

referent y + ( same ) y * -- yresolver y 1 y -- -- -- --referrer y 1 y -- -- -- --referring e n 0 -- -- -- -- --requester n 0 -- -- -- -- --serviceType n 0 -- -- -- -- --

Bison-Futé’s ContextObject descriptorOpenURL y/n # id mid mdesc mdescpt mpidreferent y 1 y y y y yresolver y 1 y -- -- -- --referrer y 1 y -- -- -- --referring e y 1 y -- -- -- --requester y 1 y -- -- -- --serviceType y + y -- -- -- --

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Determine:• regarding id, mid:

• global namespaces that are crucial for open reference linking (referent, resolver, ….)

• define; • accord NIDs.

• allow local namespaces? how to distinguish from globals?

Example of procedure

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Determine:• regarding id, mid:

• global namespaces that are crucial for open reference linking (referent, resolver, ….)

• define; • accord NIDs.

• allow local namespaces? how to distinguish from globals?

• re mdesc, mdescpt: metadataformat(s) that are crucial for open reference linking (referent).

• define• accord MFTID

Example of procedure

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Determine:• regarding id, mid:

• global namespaces that are crucial for open reference linking (referent, resolver, ….)

• define; • accord NIDs.

• allow local namespaces? how to distinguish from globals?

• re mdesc, mdescpt: metadataformat(s) that are crucial for open reference linking (referent).

• define• accord MFTID

Spec to encode everything as URL => Revised OpenURL

Example of procedure