Colon symbol in URI?

Hello all,

I am trying to find out if it is possible to use colon symbol in the URI
of RDF/OWL classes, for example:
http://purl.obofoundry.org/obo/SMTH:0000353. On one hand, I could not find
any mention of it being restricted on W3C web-page, but on the other hand,
I could not find any ontology example having a colon in a class URI
(except the colon after http) either. Moreover, OBO to OWL converters
usually replace colon symbols used in OBO identifiers with an underscore,
e.g. Protege will convert smth:0000053 to
http://purl.obofoundry.org/obo/SMTH_0000353 (not to
http://purl.obofoundry.org/obo/SMTH:0000353).

Does it mean colon is prohibited?

Thanks for your help,

Anna

Received on Thursday, 11 August 2011 22:39:43 UTC