[Tdwg-guid] Jena examples?
peter.hollas at thomson.com
peter.hollas at thomson.com
Tue Sep 26 11:37:32 CEST 2006
Hi Steve,
I can't seem to get your example to give me <tn:TaxonName
rdf:about="lsid info">, it just seems to add a property.
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about="urn:lsid:zoobank.org:taxon:123">
<rdf:type>http://tdwg.org/2006/03/12/TaxonNames/TaxonName</rdf:type>
</rdf:Description>
</rdf:RDF>
>>>From my code...
ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
Model model = ModelFactory.createDefaultModel();
Resource res = model.createResource(lsid.toString());
res.addProperty(model.createProperty("http://www.w3.org/1999/02/22-rdf-s
yntax-ns#type"), TN_NS + "TaxonName");
model.write(byteStream, "RDF/XML-ABBREV");
return new MetadataResponse(new
ByteArrayInputStream(byteStream.toByteArray()),null,MetadataResponse.RDF
_FORMAT);
Many thanks, Peter.
-----Original Message-----
From: Steve Perry [mailto:smperry at ku.edu]
Sent: 25 September 2006 20:54
To: Hollas, Peter (TS UK); tdwg-guid at mailman.nhm.ku.edu
Subject: Re: [Tdwg-guid] Jena examples?
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#">
<j.0:TaxonName rdf:about="http://test">
<j.0:testProperty>test</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 at us.ibm.com
>
> tdwg-guid-bounces at 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#">
>> <rdf:Description rdf:about="http://test">
>> <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#">
>>
>> <!-- 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:title>Amaryllidaceae J.St.-Hil.</dc:title>
>> <dcterms:created>2004-01-20 00:00:00.0</dcterms:created>
>> <dcterms:modified>2005-06-23
>> 15:45:33.0</dcterms:modified>
>> <tn:rankString>fam.</tn:rankString>
>> <tn:nameComplete>Amaryllidaceae</tn:nameComplete>
>> <tn:uninomial>Amaryllidaceae</tn:uninomial>
>> <tn:authorship>J.St.-Hil.</tn:authorship>
>> <tn:publishedIn>Expos. Fam. Nat. 1: 134. 1805 [Feb-Apr
>> 1805]</tn:publishedIn>
>> <tn:year>1805</tn:year>
>> <tn:typifiedBy>
>> <tn:NomenclaturalType>
>> <dc:title>Amaryllis 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 at 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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>> TDWG-GUID at mailman.nhm.ku.edu
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>>
>
>
>
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