On 20/01/11 15:56, Reto Bachmann-Gmuer wrote:
Hi
It retreives the map and then asks for the set of entries. So it seems
there's no way to bind it to a service, it wants to know all possible
bindings before it starts.
I created JENA-31 to have a more felxible support here.
Cheers,
reto
Why not override the other methods? - presumable it's calling
getNsPrefixMap.
The contract to the writer (and this applies to all writers, not just
RDF/XML) is "here's some prefixes, here's some RDF, go write stuff as
best you can". Adding calls into the application for decisions still
requires application code.
RDF/XML is special because to write properties in RDF/XML requires an
XML namespace. Other formats do not need any prefixes to write legal
output and would be greatly complicated to have
Prefixes often get set because they are in the input. Carrying them
around is convenient and (as we have found) expected by users even if
not used.
For the specific use case in Clerezza,
1/ Layer the problem.
Why not look through the model, decide the prefixes you do want, then
set the prefix mapping for model and then write it. This gives the
application (i.e. Clerezza) a chance to influence the choices.
2/ Set the prefixes when the data is created - this seems to me to be
the more natural point to make choices.
Andy
On Thu, Jan 20, 2011 at 4:33 PM, Chris Dollin
<[email protected]>wrote:
On Thursday, January 20, 2011 03:00:26 pm Reto Bachmann-Gmuer wrote:
Hello
I'm trying to connect the jena serializers to a service that delivers
curie-prefix suggestions for uri-prefixes.
My fisrt attempt doesn't seem to work:
Model model = ModelFactory.createModelForGraph(graph);
model.setNsPrefixes(new PrefixMappingImpl() {
@Override
protected String get(String prefix) {
System.out.println("getting "+prefix);
return super.get(prefix);
}
@Override
public String getNsURIPrefix(String uri) {
System.out.println("getting prefix for "+uri);
if ("http://example.org/".equals(uri)) {
return "ex";
}
return null;
}
});
RDFWriter writer = model.getWriter(jenaFormat);
writer.write(model, serializedGraph, "");
the overwritten methods seem not be called. The examples I found all deal
with registering individual prefix-mappings, in my case I want to access
a
service that suggests a prefix.
The RDF/XML writer calls getNsPrefixMap() to get the entire prefix mapping
as a map and then fiddles with that, so, you're right: the methods you
wrote are not called.
Chris
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