On 23/12/2011 07:30, Srimanth Gunturi wrote:
Hello,
I have a model which contains a reified statement. Depending on what URLs I
use for resources, I get different outputs.
I would be thankful if someone could explain if this behavior is valid or a
bug.
Just looking at the outputs they both look correct. In the first case
the writer has chosen an order which allowed it to use the "rdf:ID"
shortcut on the reified statement, in the second case it has used the
full syntax.
The way to double check would be to convert both outputs to Turtle,
which doesn't have a shortcut syntactic form for reification, and
compare those outputs.
You can tune the serialization a little if you need to, for example
setting to dcterms:Agent to be a "pretty type" would encourage the first
form of output. See [1].
Dave
[1]
http://incubator.apache.org/jena/documentation/io/iohowto.html#advanced_rdfxml_output
Thanks.
Sample code:
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public class JenaReifiedProblem {
private static final String someBase = "http://someserver/myapp";;
public static void main(String[] args) {
generate1("http://localhost:8080";);
System.out.println("---------");
generate1("http://localhost:8080/app";);
System.out.println("---------");
}
public static void generate1(String serverURL) {
Model model = ModelFactory.createDefaultModel();
model.setNsPrefix("dcterms", DCTerms.NS);
Resource agent = model.createResource(serverURL+"/agent1", DCTerms.Agent);
Resource fileFormat = model.createResource("http://formatsite.org/fileformat";,
DCTerms.FileFormat);
fileFormat.addProperty(DCTerms.title, "TXT");
agent.addProperty(DCTerms.format, fileFormat);
agent.addProperty(DCTerms.relation,
model.createResource(serverURL+"/agent2"));
ReifiedStatement rs =
agent.getProperty(DCTerms.relation).createReifiedStatement(someBase+"#relationship");
rs.addProperty(DCTerms.title, "My releationship");
model.write(System.out, "RDF/XML-ABBREV", someBase);
}
}
********************************************
Output:
********************************************
<rdf:RDF
xmlns:dcterms="http://purl.org/dc/terms/";
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";>
<dcterms:Agent rdf:about="http://localhost:8080/agent1";>
<dcterms:relation rdf:ID="relationship" rdf:resource="
http://localhost:8080/agent2"/>
<dcterms:format>
<dcterms:FileFormat rdf:about="http://formatsite.org/fileformat";>
<dcterms:title>TXT</dcterms:title>
</dcterms:FileFormat>
</dcterms:format>
</dcterms:Agent>
<rdf:Statement rdf:about="#relationship">
<dcterms:title>My releationship</dcterms:title>
</rdf:Statement>
</rdf:RDF>
---------
<rdf:RDF
xmlns:dcterms="http://purl.org/dc/terms/";
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";>
<dcterms:FileFormat rdf:about="http://formatsite.org/fileformat";>
<dcterms:title>TXT</dcterms:title>
</dcterms:FileFormat>
<rdf:Statement rdf:ID="relationship">
<rdf:subject>
<dcterms:Agent rdf:about="http://localhost:8080/app/agent1";>
<dcterms:relation rdf:resource="http://localhost:8080/app/agent2"/>
<dcterms:format rdf:resource="http://formatsite.org/fileformat"/>
</dcterms:Agent>
</rdf:subject>
<rdf:predicate rdf:resource="http://purl.org/dc/terms/relation"/>
<rdf:object rdf:resource="http://localhost:8080/app/agent2"/>
<dcterms:title>My releationship</dcterms:title>
</rdf:Statement>
</rdf:RDF>
---------
********************************************
