Hi Frans, Oscar, all
> As for using xsd:anyURI, I am happy with it (I would probably prefer having a class CRS with instances for it, as I think that was suggested by Ghislain Atemezing some time ago, but having the anyURI datatype seems sufficient to me at this point.
Thanks Oscar for pointing that out.
Yes, few months ago I was giving the status of two vocabularies on CRSs an Geometries, based on the IGN-France requirements. For recall, they are respectively at http://data.ign.fr/def/ignf and http://data.ign.fr/def/geometrie .
The first vocabulary is specific for CRS, and there is a property (geom:crs) with domain a geom:Geometry and range ignf:CRS.
At that time, I wrote a small service on top of the CRSs converted into RDF here http://www.eurecom.fr/~atemezin/ignf-lookup/.
Best,
Ghislain