= RDL as (better) OWL =
The RDL is available as OWL already. You can download it from our version control system, or browse it at http://data.posccaesar.org/rdl/.

However, we are not very happy with the current data model: http://rds.posccaesar.org/2008/02/OWL/ISO-15926-2_2003

The data model was created in 2008 to reflect 15926 part 2 as an OWL ontology. A major concept in the model is reified relationships. This allowed the modellers to represent relationships that have relationships in a simple way.

Modelling the statement "all cars are vehicles" would use a specialisation relationship to make "car" a subclass of "vehicle".

||Relationship||Sparql query||Note||
||Specialization||http://staging.data.posccaesar.org/rdl/?querySet=PREFIX%20owl%3A%20%3Chttp%3A%2F%2Fwww.w3.org%2F2002%2F07%2Fowl%23%3E%0APREFIX%20rdf%3A%20%3Chttp%3A%2F%2Fwww.w3.org%2F1999%2F02%2F22-rdf-syntax-ns%23%3E%0APREFIX%20rdfs%3A%20%20%3Chttp%3A%2F%2Fwww.w3.org%2F2000%2F01%2Frdf-schema%23%3E%0APREFIX%20xsd%3A%20%3Chttp%3A%2F%2Fwww.w3.org%2F2001%2FXMLSchema%23%3E%0APREFIX%20fn%3A%20%3Chttp%3A%2F%2Fwww.w3.org%2F2005%2Fxpath-functions%23%3E%0APREFIX%20p2%3A%20%3Chttp%3A%2F%2Frds.posccaesar.org%2F2008%2F02%2FOWL%2FISO-15926-2_2003%23%3E%0APREFIX%20rds%3A%20%3Chttp%3A%2F%2Frdl.rdlfacade.org%2Fdata%23%3E%0APREFIX%20afn%3A%20%3Chttp%3A%2F%2Fjena.hpl.hp.com%2FARQ%2Ffunction%23%3E%0APREFIX%20dc%3A%20%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Felements%2F1.1%2F%3E%0A%0APREFIX%20rdl%3A%20%3Chttp%3A%2F%2Fdata.posccaesar.org%2Frdl%2F%3E%0APREFIX%20ptrn%3A%20%3Chttp%3A%2F%2Fdata.posccaesar.org%2Fptrn%2F%3E%0A%0A%0A%23%23%23%20select%20relationships%20on%20relationships%20for%20specialization%20%23%23%23%0Aselect%20*%20where%20%7B%0A%0A%3Frel%20p2%3AhasSubclass%20%3Fsub%3B%0A%20p2%3AhasSuperclass%20%3Fsup.%0A%0A%0A%3Frel2%20%3Fb%20%3Frel%3B%0A%20%20%20%20%3Fc%20%3Frel3%3B%0A%20%20%20%20a%20%3Frel2Type.%0A%20%20%20%20%0A%3Frel3%20%3Fd%20%3Fe.%20%20%20%20%0A%0AFilter(%3Frel3%20!%3D%20%3Frel)%0A%0AFilter(STRSTARTS(str(%3Fb)%2C%20%22http%3A%2F%2Frds.posccaesar.org%2F2008%2F02%2FOWL%2FISO-15926-2_2003%23%22))%0A%0A%0A%7D%0A%0Alimit%20100||show all relationships on relationships for specialization||
||Specialization||http://staging.data.posccaesar.org/rdl/?querySet=PREFIX%20owl%3A%20%3Chttp%3A%2F%2Fwww.w3.org%2F2002%2F07%2Fowl%23%3E%0APREFIX%20rdf%3A%20%3Chttp%3A%2F%2Fwww.w3.org%2F1999%2F02%2F22-rdf-syntax-ns%23%3E%0APREFIX%20rdfs%3A%20%20%3Chttp%3A%2F%2Fwww.w3.org%2F2000%2F01%2Frdf-schema%23%3E%0APREFIX%20xsd%3A%20%3Chttp%3A%2F%2Fwww.w3.org%2F2001%2FXMLSchema%23%3E%0APREFIX%20fn%3A%20%3Chttp%3A%2F%2Fwww.w3.org%2F2005%2Fxpath-functions%23%3E%0APREFIX%20p2%3A%20%3Chttp%3A%2F%2Frds.posccaesar.org%2F2008%2F02%2FOWL%2FISO-15926-2_2003%23%3E%0APREFIX%20rds%3A%20%3Chttp%3A%2F%2Frdl.rdlfacade.org%2Fdata%23%3E%0APREFIX%20afn%3A%20%3Chttp%3A%2F%2Fjena.hpl.hp.com%2FARQ%2Ffunction%23%3E%0APREFIX%20dc%3A%20%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Felements%2F1.1%2F%3E%0A%0APREFIX%20rdl%3A%20%3Chttp%3A%2F%2Fdata.posccaesar.org%2Frdl%2F%3E%0APREFIX%20ptrn%3A%20%3Chttp%3A%2F%2Fdata.posccaesar.org%2Fptrn%2F%3E%0A%0A%0Adescribe%20%3Frel%20where%20%7B%0A%0A%7B%0A%20%3Frel%20a%20p2%3ABoundaryOfNumberSpace.%0A%7D%0AUNION%7B%0A%20%3Frel%20a%20p2%3ABoundaryOfPropertySpace.%0A%7D%0AUNION%7B%0A%20%3Frel%20a%20p2%3ASpecializationByDomain.%0A%7D%0AUNION%7B%0A%20%3Frel%20a%20p2%3ASpecializationByRole.%0A%7D%0AUNION%7B%0A%20%3Frel%20a%20p2%3ASpecializationOfIndividualDimensionFromProperty.%0A%7D%0A%0A%7D%0A%0Alimit%20100 ||show all uses of relationships that are [rdfs:subClass rdfs:subClass]Of the specialization relationship in the p2 datamodel.||