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Introduction to Dublin Core Metadata
The document provides an introduction to Dublin Core metadata, including: 1) Dublin Core is a set of metadata standards including 15 simple elements and over 50 qualified elements for describing resources. 2) Dublin Core metadata can be used to improve resource discovery and is recommended for metadata harvesting and the semantic web. 3) Custom mappings can be made from other metadata standards like LOM to the Dublin Core Abstract Model to make metadata interoperable.
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Introduction to Dublin Core Metadata
- 1. Introduction to Dublin CoreMetadata Hannes Ebner Knowledge Management Research group Royal Institue of Technology (KTH), Sweden 1
- 2. Dublin Core Metadata Initiative(DCMI) http://dublincore.org • 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. 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. 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. 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. DCMI Terms - QualifiedDublin 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. DCMI Terms - QualifiedDublin 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. Dublin Core inRDF • 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. Custom Extensions toDC • 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. 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. Links The Dublin CoreMetadata Initiative http://dublincore.org DCMI Metadata Basics http://dublincore.org/metadatabasics/ DCMI Metadata Terms http://dublincore.org/documents/dcmiterms/ Joint DCMI/IEEE LTSC Taskforce http://dublincore.org/educationwiki/DCMIIEEELTSCTaskforce 11