- From: Alistair Miles <alistair.miles@zoo.ox.ac.uk>
- Date: Tue, 12 May 2009 10:36:42 +0100
- To: Thomas Bandholtz <thomas.bandholtz@innoq.com>
- Cc: public-esw-thes@w3.org
Hi Thomas, To formally state property chain axioms, you need OWL 2. Because OWL 2 is not a W3C Recommendation yet, we have not used any OWL 2 features in the SKOS RDF schema. Antoine has experimented with this (see [1]), but it's unofficial as yet. You can get the desired inference via other means, e.g., procedurally, or via some inference rules. E.g. as forward rules using the Jena rule syntax [2]: # Jena rules for SKOS-XL to vanilla SKOS labeling property dumb-down @prefix skos: <http://www.w3.org/2004/02/skos/core#>. @prefix skosxl: <http://www.w3.org/2008/05/skos-xl#>. [S55: (?x skosxl:prefLabel ?y) (?y skosxl:literalForm ?z) -> (?x skos:prefLabel ?z)] [S56: (?x skosxl:altLabel ?y) (?y skosxl:literalForm ?z) -> (?x skos:altLabel ?z)] [S57: (?x skosxl:hiddenLabel ?y) (?y skosxl:literalForm ?z) -> (?x skos:hiddenLabel ?z)] Hth, Alistair [1] http://lists.w3.org/Archives/Public/public-swd-wg/2009Mar/0043.html [2] http://jena.sourceforge.net/inference/#rules On Tue, May 12, 2009 at 08:54:34AM +0200, Thomas Bandholtz wrote: > Hy, > > looking at the property chain definitions (S 55-57) in > http://www.w3.org/TR/skos-reference/#xl-labels, > I cannot find them in the formal RDF of skosxl. > > Primer says: > http://www.w3.org/TR/2008/WD-skos-primer-20080829/#secrelationshipslabels > "If an instance of xl:Label is attached to a concept by, say, a > skos-xl:altLabel statement, it follows from the SKOS-XL semantics that > the literal form of the xl:Label instance is related to this concept by > a standard skos:altLabel statement. In the above example, ex:FAO > therefore has "FAO"@en" as alternative (literal) label." > > How can any RDF tool behave like that and display skosxl:literalForm > "FAO" in this example just like it would display the direct literal of a > skos:altLabel? > > Are these semantics informal? > Did I miss something? > > Kind regards, > Thomas > > -- > Thomas Bandholtz, thomas.bandholtz@innoq.com, http://www.innoq.com > innoQ Deutschland GmbH, Halskestr. 17, D-40880 Ratingen, Germany > Phone: +49 228 9288490 Mobile: +49 178 4049387 Fax: +49 2102 77160-1 > > > -- Alistair Miles Senior Computing Officer Image Bioinformatics Research Group Department of Zoology The Tinbergen Building University of Oxford South Parks Road Oxford OX1 3PS United Kingdom Web: http://purl.org/net/aliman Email: alistair.miles@zoo.ox.ac.uk Tel: +44 (0)1865 281993
Received on Tuesday, 12 May 2009 09:37:20 UTC