- From: Dave Reynolds <dave.e.reynolds@gmail.com>
- Date: Sat, 13 Aug 2011 17:34:11 +0100
- To: Jonathan Rees <jar@creativecommons.org>
- Cc: OWL Development Mailing List <public-owl-dev@w3.org>, zhutchok@ebi.ac.uk
On Fri, 2011-08-12 at 13:50 -0400, Jonathan Rees wrote:
> But URI syntax, in particular whether you can put two colons in a URI
> (i.e. RDF URI Reference and/or IRI), is not up to any of these
> specifications. That would be up to RFC 3986, which delegates to RFC
> 2616, which delegates to RFC 2396, which says that : is reserved and
> has to be %-escaped. In practice I suspect this is not always done,
> and perhaps the new IRI spec (in progress) will say something about
> that.
Not sure that's right. The relevant grammar rules from RFC 3986 are:
path = path-absolute / ... other options omitted
path-absolute = "/" [ segment-nz *( "/" segment ) ]
segment = *pchar
segment-nz = 1*pchar
pchar = unreserved / pct-encoded / sub-delims / ":" / "@"
So "SMTH:0000353" is a legal segment and "/obo/SMTH:0000353" a legal
path and "http://purl.obofoundry.org/obo/SMTH:0000353" a legal URI.
Isn't it?
The same was true in RFC2396:
path = [ abs_path | opaque_part ]
path_segments = segment *( "/" segment )
segment = *pchar *( ";" param )
param = *pchar
pchar = unreserved | escaped |
":" | "@" | "&" | "=" | "+" | "$" | ","
As Markus says, it can't be abbreviated to QName form in RDF/XML and so
can't be used as a property but you *can* use it as a class and still
serialize in RDF/XML because there is no requirement to use abbreviated
forms for classes. For example, Jena will produce legal RDF/XML such as:
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:j.0="http://purl.obofoundry.org/obo/SMTH:0000353"
xmlns:owl="http://www.w3.org/2002/07/owl#">
<owl:Class rdf:about="http://purl.obofoundry.org/obo/SMTH:0000353"/>
<rdf:Description rdf:about="http://www.openjena.com/test#i">
<rdf:type
rdf:resource="http://purl.obofoundry.org/obo/SMTH:0000353"/>
</rdf:Description>
</rdf:RDF>
Dave
Received on Saturday, 13 August 2011 16:34:44 UTC