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 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?

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 /

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

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

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 /

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

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