[redland-dev] Round tripping rdfxml forgets xmlns
sebastian.jansen at gmail.com
Sat Sep 23 14:13:50 UTC 2006
On 9/22/06, Justin Bonnar <jbonnar at berkeley.edu> wrote:
> Hi Chris,
I guess, you mean Sebastian :-)
Thus, the foaf and rtm name space is completely forgotten or squeezed in in
> a weird way... Any hints to avoid this?
> By default, Redland doesn't store the namespace mappings in the model, and
> the rdfxml serializer doesn't do any pre-processing. You can get around
> this by registering the namespaces you want with the serializer. If you
> want to "pretty-print" more complex RDF/XML documents, try using the
> rdfxml-abbrev serializer instead. I don't know Perl very well but try
> something like:
> my $serializer =3D new RDF::Redland::Serializer("rdfxml-abbrev");
> $serializer->set_namespace("foaf", "http://xmlns.com/foaf/0.1");
> $serializer->set_namespace("rtm", "http://psi.ontopia.net/rtm/# ");
Ah, perfect. That's a good way to come around with my problem.
Also, the RDF/XML in your initial example isn't quiet right: you can't use
> qnames for URIs.
Okay, thanks. Good to know...
If you want to abbreviate them, you'll need to define entities in a DOCTYPE
> like as follows:
> <!DOCTYPE rdf:RDF [
> <!ENTITY rdf " http://www.w3.org/1999/02/22-rdf-syntax-ns#">
> <!ENTITY rtm " http://psi.ontopia.net/rtm/#">
> <!ENTITY foaf " http://xmlns.com/foaf/0.1/">]>
> <rdf:RDF xmlns:rdf=3D"&rdf;" xmlns:foaf=3D"&foaf;" xmlns:rtm=3D"&rtm;">
> <rdf:Description rdf:about=3D"&rdf;type">
> <rtm:maps-to rdf:resource=3D"&rtm;instance-of"/>
> <rdf:Description rdf:about=3D"&foaf;name">
> <rtm:maps-to rdf:resource=3D"&rtm;basename"/>
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