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Requirements on Metadata

Requirements on Metadata. multiple softwares to use metadata management of changing standards needs to be functional, simple and interoperable human and machine use. Solutions for Metadata . modularization allows distinct handling of e.g. access, semantics, administration

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Requirements on Metadata

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  1. Requirements on Metadata • multiple softwares to use metadata • management of changing standards • needs to be functional, simple and interoperable • human and machine use Natalia Wehler: Dublin Core

  2. Solutions for Metadata • modularization allows distinct handling of e.g. access, semantics, administration • lead to the idea of the Warwick Framework: containers and packages • internet consists of communities using certain packages in this framework • Dublin Core is one package in this framework Natalia Wehler: Dublin Core

  3. Dublin Core Initiative • Since 1995 • creation and refinement of a "core" foundation of property types and values to provide semantic information on WWW resources • to improve searching and indexing on the web • to improve resource discovery on the web (DC system basically applicable on every file/format) • like a library card catalog provides indexes of book properties. Natalia Wehler: Dublin Core

  4. Aims of Dublin Core • metadata has to be simple to create and to maintaine.g. there is only a small number of elements • semantics have to be commonly understandablee.g. basic information is in any case available for “digital tourists” • international application • extensibilitye.g. metadata sets for the needs of their communities • applicable to any file/format Natalia Wehler: Dublin Core

  5. Additional Principles • One-to-One-Principlee.g. Not the painter of a digitized image is the creator, but the person who digitized the image • Dumb-down PrincipleQualification is only to refine, not to extend the semantic scope of a property • Appropriate values for machine and human reading Natalia Wehler: Dublin Core

  6. Types of DC • Simple (unqualified) Dublin Core consists of fifteen elements<meta name="DC.element" content="Value" /> • Qualified Dublin Core : • one additional element: audience • qualifiers <meta name="DCTERMS.audience" content="software developers" /> Natalia Wehler: Dublin Core

  7. Characteristics Simple DC • all elements optional • all elements repeatable • use of the 15 elements of the Dublin Core Metadata Element Set (DCMES) Natalia Wehler: Dublin Core

  8. Dublin Core Metadata Element Set (DCMES) • 15 basic metadata elements • documents that only make use of DCMES are called simple DC or unqualified DC • “Pidgin Metadata” • http://dublincore.org/documents/dces/ Natalia Wehler: Dublin Core

  9. Example DC in XHTML Natalia Wehler: Dublin Core

  10. Qualified DC Classes of Qualifiers • Element Refinement restricts the scopeof the element • Encoding Schemehelps to interprete a value (for a machine) • http://dublincore.org/documents/2000/07/11/dcmes-qualifiers/ Natalia Wehler: Dublin Core

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