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From the SKOS spec.

Example 20 (consistent)

<MyConcept> skos:notation "303.4833"^^<MyNotationDatatype> .

New datatypes can be defined, and these are commonly called "user-defined datatypes".

What needs to be done to define ?

Is it something along the lines of

<MyNotationDatatype>
      a       rdfs:Datatype ;
      rdfs:label "Test"^^xsd:string ;
      rdfs:subClassOf rdfs:Resource .

Are there differences doing this in RDFS, OWL(2) Full, OWL-DL?

flag	asked Nov 10 at 8:07 PaulZH 41●1

Simon Reinhardt · Answer 1 · 2009-11-13 02:07:44Z UTC

OWL 2 has some powerful new features for defining datatypes. (When reading that document and all other OWL documents be sure to turn on the RDF examples first - you can do that somewhere after the table of contents.) For a SKOS notation you would probably do a regexp restriction on the datatype xsd:string. It would look like that:

<MyNotationDatatype>
   rdfs:label "XYZ notation"@en ;
   owl:equivalentClass [
      a rdfs:Datatype ;
      owl:onDatatype xsd:string ;
      owl:withRestrictions ([xsd:pattern "your regular expression goes here"])
   ] .

Using that in OWL 2 DL is no problem. If you want to stay within one of the profiles though note that defining datatypes through such restrictions isn't allowed in any of them. So for increased interoperability (also with OWL 1 and RDFS) you could just use xsd:string instead. That should be perfectly fine with SKOS.

How to define a own notation datatype?

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