Metadata: Namespaces

1
Metadata Namespaces

• Timothy W. Cole
• Grainger Engineering Library Information Center
• University of Illinois at Urbana-Champaign
• http//dli.grainger.uiuc.edu
  thabing_at_uiuc.edu

2
Namespaces Used

• RDF Namespace Used To Encapsulate Metadata Items
  Provide Granular Structure
• DC Namespace Used To Encapsulate All Searchable
  Metadata
• All DC tags except DCContributor Are Used
• Now Adding DCQ Namespace
• Used in Combination with Project-Specific IDLI
  Namespace to Provide Additional Granularity
• Both Refinement Encoding Scheme DCQ Used

3
Example Using DCQ

• ltrdfbaggt ltrdfligt ltdcDescriptiongt
  ltdcqabstractgtFull displacement and
  stress fields in a two-dimensional
  lt/dcqabstractgt lt/dcDescriptiongt
  lt/rdfligtlt/rdfbaggt

4
Example including IDLI Elements

• ltrdfseqgt ltrdfligt ltdcCreatorgt
  ltidliauthor_infogt ltidliauthor_namegtGorba
  tikh, Larissalt/idliauthor_namegt
  ltidliorganization_namegtDepartment of
  Mechanical...lt/idliorganization_namegt
  lt/idliauthor_infogt lt/dcCreatorgt
  lt/rdfligt

5
XML Implementation Issues

• Elements vs. Attributes
• Using Attributes of One Namespace to Qualify
  Elements of Another Namespace
• Nesting DC and IDLI elements
• We Store As Makes Most Sense for Our Project,
  Then Transform to Other XML or XHTML
• Our Storage Format Not Fully Consistent with
  Current DC Working Drafts

6
DCQ Usage (Preliminary)

• DCQAbstract replaces IDLIAbstract
• DCQExtent replaces IDLIsize
• DCQMedium replaces IDLIMIME
• DCQSpatial replaces IDLIPlace
• DCQTemporal replaces IDLITime
• DCQ Enc. Schemes replace IDLIControlled_Term,
• IDLIControlled_Term_Authority(A)
• DCQ Date Quals replace IDLIDate, IDLIDate_Event
• DCQ Relation Quals replace IDLIAlternate,
  External, Part
• Some IDLI Attributes Persist