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Introduction to Dublin Core Metadata


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Introduction to Dublin Core Metadata

  1. 1. Introduction to Dublin Core Metadata Hannes Ebner Knowledge Management Research group Royal Institue of Technology (KTH), Sweden 1
  2. 2. Dublin Core Metadata Initiative (DCMI) • General descriptive metadata • Dublin Core Abstract Model – Information model independent of format • 1998: Dublin Core Element Set 1.0, IETF RFC2413 • 2000/2001/2003: EU/US/ISO recommendation/standard 2
  3. 3. DCMI • Metadata Terms and Element Sets • Resource: "Anything that has an identity" – Ideal: URI for everything that is described • Resource Model: each value is – physical (books, people, etc) – digital (documents, images, etc) or – conceptual (time, subjects, etc) entity • Resource Model: built on top of the W3C Resource Description Framework (RDF) 3
  4. 4. Interoperability • Set of interoperable metadata standards • Used for metadata harvesting (OAI-PMH): requirement to support DC • RSS 1.0: the most flexible feed format (not widely adopted) 4
  5. 5. Dublin Core Elements - Simple Dublin Core identifier, creator, contributor, publisher, title, description, language, subject, coverage, format, type, date, relation, source, rights • 15 elements • All optional • Repeatable • Domain independent • dc namespace 5
  6. 6. DCMI Terms - Qualified Dublin Core abstract, accessRights, accrualMethod, accrualPeriodicity, accrualPolicy, alternative, audience, available, bibliographicCitation, conformsTo, contributor, coverage, created, creator, date, dateAccepted, dateCopyrighted, dateSubmitted, description, educationLevel, extent, format, hasFormat, hasPart, hasVersion, identifier, instructionalMethod, isFormatOf, isPartOf, isReferencedBy, isReplacedBy, isRequiredBy, issued, isVersionOf, language, license, mediator, medium, modified, provenance, publisher, references, relation, replaces, requires, rights, rightsHolder, source, spatial, subject, tableOfContents, temporal, title, type, valid 6
  7. 7. DCMI Terms - Qualified Dublin Core • DCMI Terms • dcterms namespace • Element refinements (more specific) • Encoding schemes (recommended): controlled vocabularies or special format • 55 elements and attribute/value pairs Examples: Language <dc:language>English (UK)</dc:language> vs <dcterms:language scheme="ISO 639-1">en-gb</dcterms:language> Date <dc:date>November 2nd, 2009</dc:date> vs <dcterms:date scheme="W3CDTF">2009-11-02</dcterms:date> 7
  8. 8. Dublin Core in RDF • DCAM maps easily into RDF (built on top of it) • Semantic Web and Linked Data • Combinable with e.g. OWL, SKOS, etc • Helps machines processing data by maintaining semantics 8
  9. 9. Custom Extensions to DC • Mappings to DC where possible • Thorough documentation necessary • Example: LOM and DCAM – IEEE LTSC / DCMI Task Force draft for mapping LOM to DCAM – First implementation by KTH – Used within Organic.Edunet 9
  10. 10. Summary • 15 metadata elements • More than 50 DCMI approved properties • Ideal for Semantic Web and Linked Data based repositories • Custom mappings to DCAM possible 10
  11. 11. Links The Dublin Core Metadata Initiative DCMI Metadata Basics­basics/ DCMI Metadata Terms­terms/ Joint DCMI/IEEE LTSC Taskforce 11