3 0 A u g u s t 2 0 0 7 Pete Johnston, Eduserv Foundation [email protected]www.eduserv.org.uk/foundation dctagging: Encoding DC metadata using Structured Tags DCMI Social Tagging Community DC-2007: Application Profiles: Theory and Practice, Singapore
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dctagging: Encoding DC metadata using Structured Tags
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30 August 2007DC-2007: Application Profiles: Theory and Practice, Singapore
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dctagging & DCAM
30 August 2007DC-2007: Application Profiles: Theory and Practice, Singapore
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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
30 August 2007DC-2007: Application Profiles: Theory and Practice, Singapore
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Flickr machine tags
30 August 2007DC-2007: Application Profiles: Theory and Practice, Singapore
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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
30 August 2007DC-2007: Application Profiles: Theory and Practice, Singapore
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Expressing the Scholarly Works (Eprints) DC Application Profile using the DSP wiki syntax
Title slide photo of Singapore Orchid Gardens by Flickr user Andries3See http://www.flickr.com/photos/andriesoudshoorn/458678695/Made available under CC Attribution-NonCommercial 2.0 license