Re: [Tdwg-guid] Jena examples?

25 Sep 2006


      Hi Peter,
Ben is right.  To get a TaxonName element (instead of an 
rdf:Description), add the following line of code:
res.addProperty(model.createProperty("
http://www.w3.org/1999/02/22-rdf-syntax-ns#type"), TN_NS + "TaxonName");
This should give you output like :
<rdf:RDF
    xmlns:j.0="http://tdwg.org/2006/03/12/TaxonNames"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#%22%3E
  <j.0:TaxonName rdf:about="http://test%22%3E
    j.0:testPropertytest</j.0:testProperty>
  </j.0:TaxonName>
</rdf:RDF>
XML namespace prefixes are not preserved in RDF so Jena will supply its 
own prefixes when serializing to one of the XML formats (hence the j.0 
instead of tn).
By the way, the IPNI example you cite has an error:
<tn:nomenclaturalCode rdf:resource="&tn;#botanical" />
Many RDF/XML parsers will see &tn; as an entity which cannot be 
resolved.  Since I don't have a copy of the ontology (and 
http://tdwg.org/2006/03/12/TaxonNames does not resolve), I can only take 
a guess that it should look something like:
<tn:nomenclaturalCode rdf:resource="tn:botanical" />
However, using XML namespace prefixes in resource references inside 
RDF/XML documents tends to cause problems because not all RDF/XML 
parsers are smart enough to dereference the namespace prefix and build a 
fully-qualified resource URI.  A safer form of the above would be the 
fully qualified resource URI which looks like:
<tn:nomenclaturalCode rdf:resource="http://tdwg.org/2006/03/12/TaxonNames/botanical" />
-Steve
Benjamin H Szekely wrote:
...
Hi Peter, 
    In XML/ABBREV mode, the serializer uses rdf:Types for element names. 
Since your example doesn't have an rdf:Type, it uses the default Jena 
element names.

Ben

Ben Szekely
IBM Software Engineer
Advanced Internet Technology, Cambridge, MA
bhszekel@us.ibm.com
tdwg-guid-bounces@mailman.nhm.ku.edu wrote on 09/25/2006 11:02:30 AM:
...
Hi Everyone,
Does anyone have/or know of any good examples of using Jena to output
RDF metadata with non-typical namespaces such as TCS/RDF?
Currently I have the following code for my metadata method(I know it's
wrong!).
String TN_NS = "http://tdwg.org/2006/03/12/TaxonNames/";
ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
Model model = ModelFactory.createDefaultModel();
Resource res = model.createResource("http://test");
res.addProperty(model.createProperty(TN_NS,"testProperty"),"test");
model.write(byteStream, "RDF/XML-ABBREV");
return new MetadataResponse(new
ByteArrayInputStream(byteStream.toByteArray()),null,MetadataResponse.RDF
_FORMAT);
...which gives me.
<rdf:RDF
    xmlns:j.0="http://tdwg.org/2006/03/12/TaxonNames/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#%22%3E
  <rdf:Description rdf:about="http://test%22%3E
    <j.0:testProperty >test</j.0:testProperty>
  </rdf:Description>
</rdf:RDF>
...whereas I could really do with something along the lines of the IPNI
metadata.
<rdf:RDF xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:dcterms="http://purl.org/dc/terms/"
    xmlns:tn="http://tdwg.org/2006/03/12/TaxonNames/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#%22%3E
<!-- example family (has an unlinked typifying name with


non-
...
standard format data)-->
    tn:TaxonName
rdf:about="urn:lsid:ipni.org:names:30000959-2:1.1.2.1"
      <tn:nomenclaturalCode rdf:resource="&tn;#botanical" />
      dc:titleAmaryllidaceae J.St.-Hil.</dc:title>
      dcterms:created2004-01-20 00:00:00.0</dcterms:created>
      dcterms:modified2005-06-23
15:45:33.0</dcterms:modified>
      tn:rankStringfam.</tn:rankString>
      tn:nameCompleteAmaryllidaceae</tn:nameComplete>
      tn:uninomialAmaryllidaceae</tn:uninomial>
      tn:authorshipJ.St.-Hil.</tn:authorship>
      tn:publishedInExpos. Fam. Nat. 1: 134. 1805 [Feb-Apr
1805]</tn:publishedIn>
      tn:year1805</tn:year>
      tn:typifiedBy
            tn:NomenclaturalType
         dc:titleAmaryllis Linnaeus, nom.
cons.</dc:title>
      </tn:NomenclaturalType>
      </tn:typifiedBy>
    </tn:TaxonName>
I think the main problem I have is creating resources that aren't
defined as vocabularies within Jena already. I can't seem to find a way
to create that <tn:TaxonName root resource element.
I'm starting to think that just outputting vanilla text could be the
best option here, or am I barking up the wrong tree?
Many thanks, Peter.
Peter Hollas MSc BSc(hons) (Peter.Hollas@thomson.com)
Software Engineer /Systems Administrator
Thomson Zoological
Innovation Centre
York Science Park
Heslington
York
YO10 5DG
Tel: 01904-435113
Fax: 01904-435114

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Re: [Tdwg-guid] Jena examples?

Steve Perry