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Update on work of Joint DCMI/IEEE LTSC Task Force

Update on work of Joint DCMI/IEEE LTSC Task Force. CETIS Metadata & Digital Repositories SIG, UKOLN, Bath. Background. Metadata standards typically developed to support requirements of some community or domain Resources used across community/domain boundaries Implementers want

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Update on work of Joint DCMI/IEEE LTSC Task Force

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  1. Update on work of Joint DCMI/IEEE LTSC Task Force CETIS Metadata & Digital Repositories SIG, UKOLN, Bath

  2. Background • Metadata standards typically developed to support requirements of some community or domain • Resources used across community/domain boundaries • Implementers want • to use component parts of different standards in combination • to (re)use components of other implementers’ work • Concept of “metadata application profile” (e.g. Heery/Patel, Duval et al) • tailor standard to context • combine components from different standards (“mix & match”) CETIS MDR SIG, Bath

  3. Abstract Models for Metadata • Abstract Model of metadata standard specifies • Nature of components and constructs used in standard • Set of rules for building abstract information structure • IEEE LOM Abstract Model • AIS = LOM instance • Data elements containing other data elements • “Leaf” data element values associated with datatypes (how value spaces interpreted) • DCMI Abstract Model • AIS = DC description set • Description = set of statements about resource • Statement • references to property, value, vocabulary encoding scheme, syntax encoding scheme • value strings, value representations CETIS MDR SIG, Bath

  4. Abstract Models & Application Profiles • Both DC and LOM have notions of “metadata application profile”… • … but based on respective Abstract Model • DC Application Profile • how to use a set of identified properties, vocabulary encoding schemes, syntax encoding schemes to construct a DC metadata description set • LOM Application Profile • how to use a set of identified LOM data elements, datatypes, vocabularies to construct a LOM instance • LOM conceptual data schema includes AM and a “base” application profile CETIS MDR SIG, Bath

  5. Abstract Models & Bindings for Metadata • Abstract Models are syntax-independent • Bindings describe • how abstract information structure is serialised/encoded in a metadata format • how instances of a metadata format are interpreted in terms of abstract information structure • Both DC & LOM have bindings to XML formats • However, formats interpreted in terms of different Abstract Models • e.g. XML element parent-child relationships have different interpretations in LOM-XML and DC-XML CETIS MDR SIG, Bath

  6. System A System B Construct usingDCAM & DCAP Interpret usingDCAM DC DescriptionSet DC DescriptionSet Encode usingBinding Decode usingBinding DC-XMLInstance DC-XMLInstance <?xml version="1.0"?><dcx:descriptionSet>

  7. System A System B Construct usingLOM AM & LOM AP Interpret usingLOM AM LOMInstance LOMInstance Encode usingBinding Decode usingBinding LOM-XMLInstance LOM-XMLInstance <?xml version="1.0"?><lom:LOM>

  8. The problem • IEEE LOM standard and Dublin Core based on different Abstract Models • LOM data elements and DC properties/classes can not be used in combination in same information structure • Earlier work on DC-LOM interoperability focused on RDF • mapping LOM to RDF • mapping DC to RDF • Not generalisable to other DC formats CETIS MDR SIG, Bath

  9. The proposed solution • Develop a LOM-DCAM mapping • “LOM data elements” => “instances of DCAM components/constructs” • Interpretation of LOM semantics in terms of DCAM • Not a binding for LOM, but a translation • lossy in part • one-way translation • Approach • conceptualise LOM as Entity-Relationship model • build on earlier work for LOM RDF binding • represent E-R model in terms of DCAM constructs • specify required terms, assign URIs CETIS MDR SIG, Bath

  10. Dublin Core Abstract Model LOM Conceptual Data Schema conforms to conforms to DC DescriptionSet LOMInstance translate (lossy) CombinedDC DescriptionSet DC DescriptionSet bound to bound to LOM-XMLInstance DC-XML Instance DC-RDF Instance

  11. Outcomes • View of LOM as a basic DC Application Profile • Availability of set of “LOM terms” which are usable in other DCAPs • Availability of RDF binding of LOM “for free” via DC RDF binding (mapping) • Separation of LOM-DCAM translation from RDF binding • First step towards better alignment of DC and LOM abstract models? CETIS MDR SIG, Bath

  12. Joint DCMI/IEEE LTSC Task Force • Initiated at DC2005 in Madrid, Sep 2005 • Reports to DC Education WG & IEEE LTSC • Chairs: Mikael Nilsson & Jon Mason • Participation open to all: • mailing list (~20 subscribers), Wiki • Joint: • Collaborative work on drafts • Joint consensus • Co-publishing of results • Aim: an IEEE “Recommended Practice” and a DCMI “Recommendation” CETIS MDR SIG, Bath

  13. Joint DCMI/IEEE LTSC Task Force • Charter approved by DCMI Advisory Board and IEEE LTSC SEC • Draft PAR Scope & Purpose presented to LOM WG (March 2006) • Three initial outputs available for discussion: • Draft of LOM-DCAM mapping • includes description of DCAP • Example instance based on mapping • LOM XML • DC Text • Draft of required property/class/value definitions • folllowing DC “Schema Model”/Usage Board conventions CETIS MDR SIG, Bath

  14. LOM-XML DescriptionSet ( Description ( ResourceURI ( <http://purl.org/poi/rdn.ac.uk/12345-67890> ) Statement ( PropertyURI ( dc:title ) ValueString ( “Wilfred Owen and Realism” Language ( en-GB ) ) ) Statement ( PropertyURI ( dc:language ) ValueString ( “en-GB” SyntaxEncodingSchemeURI ( dcterms:RFC3066 ) ) ) Statement ( PropertyURI ( lom:keyword ) VocabularyEncodingSchemeURI ( a:NLS ) ValueString ( "Owen, Wilfred" Language ( en-GB ) ) ) ) ) DC-Text <lom> <general> <identifier> <catalog>URI</catalog> <entry>http://purl.org/poi/rdn.ac.uk/12345-67890</entry> </identifier> <title> <string language="en-GB">Wilfred Owen and Realism</string> </title> <language>en-GB</language> <keyword> <string language="en-GB">Owen, Wilfred</string> </keyword> </general> </lom>

  15. Other related DCMI work • Expressing DC metadata using XML • Working Draft for public comment (June 2006) • Revised XML binding for DC • Expressing DC metadata using RDF • Working Draft for public comment (June 2006) • Mapping from DCAM to RDF • DC-Text: A Text Syntax for DC metadata • Under discussion by DC Architecture WG • Updating of DCMI term definitions • Under discussion by DC Usage Board CETIS MDR SIG, Bath

  16. Next steps • Verify mapping through more examples • Identify points of loss-iness • Finalise mapping • Finalise terms, definitions, URIs • Finalise DCAP • Special Session at DC2006 (October, 2006, Colima, Mexico) • Prepare docs for formal review/publication • Feed into DC Education WG work on DC Ed AP • Feed into IEEE LTSC work on “next generation” LOM CETIS MDR SIG, Bath

  17. Joint DCMI/IEEE LTSC Task Force http://dublincore.org/educationwiki/DCMIIEEELTSCTaskforce CETIS MDR SIG, Bath

  18. Update on work of Joint DCMI/IEEE LTSC Task Force CETIS Metadata & Digital Repositories SIG, UKOLN, Bath

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