On 15/07/15 19:50, Neil Macwan wrote:
I am building a model in Jena and am able to add resources, statements, and
properties to it. I also want to add information to this model on its own
provenance (the provenance of the model). An example of this is Example 2 at
http://www.w3.org/TR/prov-o/#narrative-example-expanded-1. I've pulled out
the part I'm interested in below:
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix sioc: <http://rdfs.org/sioc/ns#> .
@prefix prov: <http://www.w3.org/ns/prov#> .
@prefix my: <http://www.example.org/vocab#> .
@prefix : <http://www.example.org#> .
@base <http://www.example.com/derek-bundle.ttl> .
<>
a prov:Bundle, prov:Entity;
prov:wasAttributedTo :postEditor;
prov:generatedAtTime "2011-07-16T02:52:02Z"^^xsd:dateTime;
.
:derek
a prov:Person, prov:Agent; ## prov:Agent is inferred from prov:Person
foaf:givenName "Derek";
foaf:mbox <mailto:de...@example.org>;
prov:actedOnBehalfOf :national_newspaper_inc;
.The resource described by "<>" describes the document itself. It is a
prov:Bundle and a prov:Entity with other attributes. I am trying to do something similar for
my models in Jena and have not been successful. You can create resources, statements, and
properties from a model and then link them and add them to the model but there does not seem to
be a way of adding statements and properties to a model to describe the model itself. Am I
missing something or is there a way of doing this? Some sample code I have tried to achieve
this is below, this outputs an anonymous resource. How do I add statements to a model
describing the model itself?
Namespace provns = new Namespace("prov","http://www.w3.org/ns/prov#";); Model model =
ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM); Property provEntity = model.createProperty(provns.getUri() +
"Entity"); Property provBundle = model.createProperty(provns.getUri() + "Bundle"); Statement
stmt = model.createStatement(model.createResource(),provEntity,provBundle); model.add(stmt);
System.out.println("model="); RDFDataMgr.write(System.out,model,Lang.TURTLE);
Output:model=@prefix owl: <http://www.w3.org/2002/07/owl#> .@prefix rdf:
<http://www.w3.org/1999/02/22-rdf-syntax-ns#> .@prefix xsd:
<http://www.w3.org/2001/XMLSchema#> .@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
.
[ <http://www.w3.org/ns/prov#Entity>
<http://www.w3.org/ns/prov#Bundle> ] .
Neil
Neil,
<> is a shorthand. RDF always works with absolute URIs. <> (which is
the relative URI of the empty string, will be resolved to the base URI
for the document. Try parsing your Turtle file to N-Triples and you
will see what the <> becomes.
Try adding statements with that subject URI (absolute URI).
If you really want to force the <> in the output, writing with a base
URI should do it:
String baseURI = "file:/// ....." ;
Model model = ..
WriterGraphRIOT w = RDFDataMgr.createGraphWriter(Lang.TTL) ;
w.write(System.out, model.getGraph(), null, baseURI, null) ;
which puts in @base.
Andy
