[redland-dev] Abbreviating URIs in XML Attribute Values

[Dave Beckett]

On 6/17/11 1:24 AM, Nicholas J Humfrey wrote:
> Hello Dave,
> 
> I do not believe that using custom XML entities in RDF/XML is very common - or at least I havn't seen it for a long time.

That's true, but it is more common in schema and ontology tools

> 
> I am also unaware of anything in libraptor to allow you to do this.

That's correct.  raptor would have to emit a DTD subset block before
the <rdf:RDF> root element too.

It's actually not too hard but would need a few new API calls to the
serializer class and rdfxml serializer implementation and checks
for emitting URIs in attribute values, which are done in a few places
which would be straightforward to do .

> 
> If it is of any help, Turtle is a lot more concise than RDF/XML.

Although this is true, I think the better way to reduce data sizes of xml or
general text formats is to use compression and then use streaming
parsing via pipes: gunzip < bigfile.rdf.gz or popen().

Dave

> 
> nick.
> 
> 
> On 16 Jun 2011, at 14:00, David Phillips <dphillips at janya.com> wrote:
> 
>> Hello.
>>
>> I'm trying to get my RDF to be as little bloated as possible.  One way
>> of doing this is by setting namespaces on the RDF serializer.  But the
>> XML namespace spec only covers XML elements and XML attribute names.
>> It does not cover XML attribute values.  That is, you can't use a
>> qname in a context such as:
>>
>> <element attname="prefix:localname" />
>>
>> However, I've come across XML documents (in particular, OWL
>> ontologies) which have the following:
>>
>> <element attname="&prefix;localname" />
>>
>> Instead of the prefix being defined with a namespace declaration it's
>> defined with an entity declaration in the document's DOCTYPE.
>>
>> My question is: Is there any way of getting a librdf serializer to
>> generate RDF with this sort of abbreviated attribute values?
>>
>> Thanks in advance!
>>
>> -Dave Phillips
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>> redland-dev at lists.librdf.org
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