Creating an Application Profile Tutorial 3 DC2004, Shanghai Library 13 October 2004 Thomas Baker, Fraunhofer Society Robina Clayphan, British Library Pete.

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Presentation transcript:

Creating an Application Profile Tutorial 3 DC2004, Shanghai Library 13 October 2004 Thomas Baker, Fraunhofer Society Robina Clayphan, British Library Pete Johnston, UKOLN

Contents ● What problem do Application Profiles solve? ● Application Profile basics ● DCAPs and the DCMI Abstract Model ● Case studies – Describing “Collections” [Pete Johnston] – Use in Libraries [Robina Clayphan]

What problem do DCAPs solve? ● Implementors adapt standards to context: – “DC is too small! We need more terms!” – “Some of the terms must be more specific!” ● A Profile describes how an application: – Uses generic terms (e.g. Dublin Core) – Uses more specialized terms ● To describe “photographs”, “products”, “collections”... – Constrains the use of properties ● Example: “When using dc:language, values must conform to RFC 3066!”

Why do this? ● Document the metadata model of your application – Help other implementors design interoperable applications – Merge metadata from many sources – Promote convergence on “good practice” within communities of use – Solve your specific problems while following common standards for interoperability

Examples ● To describe “collections” [NISO Metasearch] ● Government Information [Australian AGLS] ● Agricultural development information [FAO] ● European Environmental Agency ● DC-Education

Basics of DCAPs ● DCAP does not define new terms – it merely cites terms defined elsewhere (e.g., in Dublin Core) ● DCAP is a set of Property Usages ● A Property Usage describes how a (previously declared) Property is used in the metadata of an application. ● All DCMI Elements and Element Refinements are Properties

A Property Usage ● References (“uses”) exactly one property defined elsewhere ● May provide additional documentation on how property is interpreted ● May give it an application-specific label ● May specify obligation (e.g., mandatory, optional, conditional) ● May specify constraints on permitted values (e.g., “encoding schemes”)

“Readable” DCAPs for use by people ● CEN CWA 14855: “DCAP Guidelines” – ftp://ftp.cenorm.be/PUBLIC/CWAs/e-Europe/MMI-DC/cwa Nov.pdf ● Emphasis on Readability – “Optimal usefulness for the intended audience” – Can include redundant information, if useful – Identify terms with “appropriate precision” (i.e. by URI Reference when possible)

No DCAPs without Metadata Vocabularies! ● In foregoing example, DC-Libraries profile “uses” the Dublin Core element “Subject” – DCMI declares this and other elements in a Metadata Vocdabulary ● dc:subject uniquely identified by DCMI with URI reference ● Note that some information from DCMI “source” document is redundantly included in the DCAP

Towards DCAPs for use by machines ● CEN CWA on “machine-processable” DCAPs in December 2004 ● Formal model of DCAPs under development – In context of broader effort to articulate the Abstract Model underlying Dublin Core metadata – Influenced by W3C Semantic Web activity – DCAPs can be represented in Resource Description Framework (RDF) – RDF representations are expressed in RDF/XML

Precise, machine- processable statements! ● Information declared (redundantly) in a Metadata Vocabulary is not included ● Only includes information which is particular to the Application Profile ● Use of formal schema language supports resolution of cross-references and merging of data

DCMI Abstract Model ● Draft of the DCMI Architecture Working Group ● Seeks to make explicit the data model which has emerged in DCMI ● Formal model against which different methods for “encoding” DC metadata can be compared

representation statement description record description set description statement property value representation value string rich value related description is grouped into is instantiated as has one or more has one is represented by one or more is a OR

Model summary record (encoded as XHTML, XML or RDF/XML) description set description (about a resource (URI)) statement property (URI) value (URI) representationvalue string OR rich value OR related description vocabulary encoding scheme (URI) syntax encoding scheme (URI) language (e.g. en-GB)

representation statement description record description set description statement property value representation value string rich value related description is grouped into is instantiated as has one or more has one is represented by one or more is a OR Which Properties are used in an application

representation statement description record description set description statement property value representation value string rich value related description is grouped into is instantiated as has one or more has one is represented by one or more is a OR Which Properties are used in an application......and how values are constrained...

representation statement description record description set description statement property value representation value string rich value related description is grouped into is instantiated as has one or more has one is represented by one or more is a OR Which Properties are used in an application......and how values are constrained......in the description sets.