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dctagging: Encoding DC metadata using Structured Tags
 

dctagging: Encoding DC metadata using Structured Tags

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Short presentation to DCMI Social Tagging Community session at DC-2007, Singapore, 2007-08-30.

Short presentation to DCMI Social Tagging Community session at DC-2007, Singapore, 2007-08-30.

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dctagging: Encoding DC metadata using Structured Tags dctagging: Encoding DC metadata using Structured Tags Presentation Transcript

  • dctagging: Encoding DC metadata using Structured Tags DCMI Social Tagging Community DC-2007: Application Profiles: Theory and Practice, Singapore
  • dctagging: DC metadata using Structured Tags
    • Context and motivation
    • Structured tagging
      • geotagging
      • dctagging
    • dctagging and DCAM
    • Flickr machine tags
  • Context & Motivation
  •  
  • Context and motivation
    • Tagging indicates some undefined relationship between the subject resource and the tag
    • Tag may be indicator of
      • topic/”about-ness” e.g. “SecondLife”, “openAccess”
      • genre/”type” e.g. “tutorial”
      • status e.g. “toRead”, “possibleBlogPost”
      • provenance/publisher e.g. “DCMI”, “JISC”
      • creator e.g. “Berners-LeeTim”, “BakerMark”
    • How do I distinguish resources about TBL from resources created by TBL?
  • Structured Tagging
  • Structured Tagging
    • Use of tag as “multi-part” entity
      • e.g. tag as key-value pair
    • “ Triple tagging”
      • three parts: prefix, key, value
      • interpretation as triple: subject URI, predicate/property URI, literal
    • Geotagging
      • geo:lat=51.4989
      • geo:lon=-0.1786
      • geotagged
      • Widely used in Flickr for photograph locations
      • See http:// geobloggers.com /
  • Structured Tagging
    • dctagging
      • DC metadata as prefixed key-value pairs in tags
      • dc:creator=Berners-LeeTim
      • dc:publisher=UKOLN
      • dctagged
    • See
      • http://efoundations.typepad.com/efoundations/2006/10/dctagged.html
  •  
  •  
  • dctagging & DCAM
  • dctagging and the DCMI Abstract Model
    • Need to decide on DCAM interpretation
    • Triple tag = prefixed/key/value
    • “ dctagged” as implicit “namespace declaration”
    • Note: no way to distinguish between
      • literal value surrogate and non-literal value surrogate
    • Propose
      • Tag -> DCAM Statement
      • Prefix/key -> DCAM Property URI
      • Value -> DCAM Literal Value Surrogate Value String
    • i.e. literal values only
  • Flickr machine tags
  • Flickr machine tagging
    • del.icio.us has no built-in support for triple tagging
    • Can’t do e.g.
      • "find all items for which the value of the dc:creator property is a literal that begins with 'Powell'" or
      • "find all items related (by any property) to the literal 'PowellAndy'“
    • Flickr support for “machine tags”
      • Uses namespacing convention borrowed from XML Namespaces
      • xmlns:dc=http://purl.org/dc/elements/1.1/
      • Flickr API supports queries using structured tags
      • http://www.flickr.com/groups/api/discuss/72157594497877875/
    • See also Dave Beckett’s Flickcurl
      • http:// librdf.org/flickcurl /
  • Expressing the Scholarly Works (Eprints) DC Application Profile using the DSP wiki syntax
    • Title slide photo of Singapore Orchid Gardens by Flickr user Andries3 See http://www.flickr.com/photos/andriesoudshoorn/458678695/ Made available under CC Attribution-NonCommercial 2.0 license
  • Expressing the Scholarly Works (Eprints) DC Application Profile using the DSP wiki syntax DC-2007: Application Profiles: Theory and Practice, Singapore