16
Octo
ber 2
00
9
Pete Johnston, [email protected]
http://www.eduserv.org.uk/research/
Miscellaneous Usage Issues
DCMI Usage Board, DC-2009, Seoul, Korea
16 October 2009DCMI Usage Board, DC-2009, Seoul, Korea 2
Simple DC
16 October 2009DCMI Usage Board, DC-2009, Seoul, Korea 3
Simple DC
• Described informally in various DCMI documents
• From viewpoint of DCAM/Singapore Framework
• Either– A “pattern” for constructing description sets
– i.e. a Description Set Profile
• Or– A DC Application Profile, which includes a DSP
16 October 2009DCMI Usage Board, DC-2009, Seoul, Korea 4
Simple DC as DSP: Suggestion 1
• DSP expression of “traditional” “Simple DC” pattern
• Description set contains one description, of resource of any type
• For each statement in description– Property URI must be from list of 15 properties of DCMES
(i.e http://purl.org/dc/elements/1.1/title etc)
– Literal value surrogate required• SES URI not permitted
• Language tag optional
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Simple DC as DSP: Suggestion 2
• Singapore 2007 Proposal (Mikael/Tom)• DSP expression of a “modernised” “Simple DC” pattern• Description set contains one description, of resource of
any type• For each statement in description
– Property URI must be from list of 15 “new” properties of DC Terms (i.e http://purl.org/dc/terms/title etc)
– Type of surrogate on case by case basis, depending on range
– For literal value surrogates• SES URI not permitted• Language tag optional
– For non-literal value surrogates• Value URI not permitted• VES URI not permitted• One value string permitted
– SES URI not permitted– Language tag optional
16 October 2009DCMI Usage Board, DC-2009, Seoul, Korea 6
Issues
• Are we labelling a DCAP or a DSP?
• Both “patterns” are “valid” DSPs
• What do we want to achieve?– To formalise the “traditional” pattern?
– To develop a “modernised” pattern (based on new terms, ranges etc)?
– Both?
• Which do we want to label “Simple DC”?
• And if we do both, what do we label the other pattern?
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Issues
• “Dumb-down”?– Generation of “Simple DC” description set?
• If “Simple DC” = “traditional” pattern– Does “dumb-down” imply mapping non-literal to
literal?
• If “Simple DC” = “modern” pattern– Non-literal supported in target so no need for
mapping
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Doc:D
“5 mins”dcterms:extent
Doc:D “5 mins”
dc:format
Dumb-down to “traditional” Simple DC
16 October 2009DCMI Usage Board, DC-2009, Seoul, Korea 9
Doc:D
“5 mins”dcterms:extent
Doc:D
dc:format
Dumb-down to “modern” Simple DC
“5 mins”
16 October 2009DCMI Usage Board, DC-2009, Seoul, Korea 10
Discussion
• “Simple DC” as “traditional” pattern– Dovetails with existing informal documentation– “Intuitive” fit with e.g. oai_dc XML format– Ignores modernisation of terms
• Continues to promote “blanket” usage of literal values
– “Dumb-down” complexity?
• “Simple DC” as “modernised” pattern– Recognises modernisation of terms
• Promotes appropriate usage of literal/non-literal values
– “Dumb-down” simpler?– Differs from existing informal documentation– Less “intuitive” fit with e.g. oai_dc XML format
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Use of dcterms:identifier
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Use of dcterms:identifier
• Use literal values – e.g. URI as literal value, not “value URI”
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Use of dcterms:identifier
• Within a single description, use dcterms:identifier only for identifiers of the described resource
• Take care with resource/representation & resource/description (httpRange-14) issues
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Use of dcterms:identifier
• Differentiating “identifier syntaxes”– Where represented as URI
• use SES = dcterms:URI (or xsd:anyURI)
• Don’t use SES = example:URN, example:UUID (etc) as these are all URIs
– Where represented as non-URI literal• use SES?
– SES = example:ASIN (etc)
• (but e.g. BIBO uses subproperties)
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Use of dcterms:identifier
• Differentiating “categories/purposes of identifier”
– Subproperties for e.g.• “local identifier”?
16 October 2009DCMI Usage Board, DC-2009, Seoul, Korea 16
Miscellaneous Usage Issues
Title slide photo “Seoul Gyeongbok Palace” by Flickr user storyvillegirlSee http://www.flickr.com/photos/bibbit/2948779230/Made available under CC Attribution-Share-Alike 2.0 license
16
Octo
ber 2
00
9
Pete Johnston, [email protected]
http://www.eduserv.org.uk/research/
Dublin Core Description Set Profiles
DC-2009, Seoul, Korea