Hi:
I've got another couple questions about RDF/XML-ABBREV format.
When using the RDF/XML-ABBREV serializer to output a pretty-printed graph on
our subject taxonomy but we get object nodes expanded inline on their first
mention. See example output below [1] where I've shown only the URI references
for convenience and suppressed the literal properties.
This makes for a very uneven XML. (I know that the RDF is fine though. But we
want some regular XML.)
Also, and much more importantly, if we add in skos:narrower links this then
creates some kind of pathological behaviour and the serialization then takes
some **90 mins** or more instead of seconds or less. (The graph size is about
90,000 triples with ~3,000 subjects.)
We wanted to know if there was any way to suppress node expansion in the Jena
RDF/XML-ABBREV output as we'd really like to use Java for portability in our
build workflows.
We tried various "blockRules" property combinations to control the RDF/XML
output but to no avail - see Scala code here.
==
val out = new FileOutputStream(file)
try {
// model.write(out, format )
val writer = model.getWriter(format);
if (format.equals("RDF/XML-ABBREV")) {
writer.setProperty("blockRules", "propertyAttr");
}
writer.write(model, out, null);
} finally {
out.close()
}
==
However, if we output the same graph in TURTLE and then use an external tool -
the Redland rapper utility which also supports RDF/XML-ABBREV - we get the very
regular (and decidedly pretty) flat RDF/XML output as shown in [2].
Is there any way we can control this expansion better in Jena or do we need to
use an external tool like rapper?
The basic RDF/XML output from Jena is not what we need. We just need a better,
more regular, RDF/XML-ABBREV such as the rapper output.
Thanks,
Tony
[1]
<npg:Subject rdf:about="http://ns.nature.com/subjects/periodontitis";>
<skos:broader>
<npg:Subject rdf:about="http://ns.nature.com/subjects/periodontics";>
<skos:broader>
<npg:Subject rdf:about="http://ns.nature.com/subjects/dentistry";>
<skos:broader>
<npg:Subject
rdf:about="http://ns.nature.com/subjects/health-care";>
<skos:related>
<npg:Subject
rdf:about="http://ns.nature.com/subjects/health-services";>
<skos:broader
rdf:resource="http://ns.nature.com/subjects/health-care"/>
</npg:Subject>
</skos:related>
<skos:related>
</npg:Subject>
</skos:related>
</npg:Subject>
</skos:broader>
</npg:Subject>
</skos:broader>
</npg:Subject>
</skos:broader>
<skos:broader>
<npg:Subject rdf:about="http://ns.nature.com/subjects/oral-diseases";>
<skos:broader>
<skos:broader
rdf:resource="http://ns.nature.com/subjects/health-sciences"/>
</npg:Subject>
</skos:broader>
</npg:Subject>
</skos:broader>
</npg:Subject>
[2]
<npg:Subject rdf:about="http://ns.nature.com/subjects/periodontitis";>
<skos:broader rdf:resource="http://ns.nature.com/subjects/oral-diseases"/>
<skos:broader rdf:resource="http://ns.nature.com/subjects/periodontics"/>
</npg:Subject>
<npg:Subject rdf:about="http://ns.nature.com/subjects/oral-diseases";>
...
</npg:Subject>
<npg:Subject rdf:about="http://ns.nature.com/subjects/periodontics";>
...
</npg:Subject>
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