Maatary Daniel OKOUYA wrote:
> Can anyone help me understand this different of output. I listing all
> the subject in the RDF Graph then print their details. After what i
> list all object of the graph and if they are a ressource convert them
> in the ressource they are and print
>
> However, i get totaly different answer as you can see below
(a) You have different code for the two cases; of course the answers
look different.
(b) In any case, the sets of subjects and objects in a graph need
not be the same. Consider the trivial graph {(S P O)}; listSubjects
will get you {S} (with one property P) and listObjects will get you
{O} (with no properties). Similarly {(S P X; X Q Y)} has subjects
S and X, but objects X and Y.
(c) Don't use getLocalName(); you're setting yourself up for long-term
trouble because different resources (different, as in having different
URIs) can have the same local name. Like, eg, type.
(Sometimes getLocalName is the right thing to do, but usually what
it means is there's some design left to be done.)
Chris
>
>
>
> static final String inputFileName = "data/promise.rdf";
>
> public static void main(String[] args) {
>
> // create an empty model
> Model model = ModelFactory.createDefaultModel();
>
> // use the FileManager to find the input file
> InputStream in = FileManager.get().open(inputFileName);
> if (in == null) {
> throw new IllegalArgumentException( "File: " +
> inputFileName + " not found");
> }
>
> // read the RDF/XML file
> model.read(new InputStreamReader(in), "");
>
> ResIterator it = model.listSubjects();
> NodeIterator nodit = model.listObjects();
> Resource res = null;
> StmtIterator propIt = null;
>
>
> while (it.hasNext()) {
>
> res = it.nextResource();
>
> System.out.println("res:" + res.toString());
>
> propIt = res.listProperties();
>
> while (propIt.hasNext())
> System.out.println("property: " +
> propIt.nextStatement().getPredicate().getLocalName());
>
> }
>
>
> System
> .out
> .println
> ("\n>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Objects>>>>>>>>>>>>>>>>>>>>>>>\n");
> res = null;
> propIt = null;
>
> while (nodit.hasNext()) {
> RDFNode nod = nodit.nextNode();
>
> System.out.println("nod:" + nod.toString() + " : " +
> nod.isResource());
>
> if (nod.isResource()) {
> res = nod.asResource();
>
> System.out.println("res:" + res.toString() + "
> : " +
> res.getLocalName());
>
> //propIt = res.listProperties();
>
> }
> }
>
>
> }
>
>
> res:http://www.people.lu.unisi.ch/fornaran/example/promise#JohnAction1
> property: hasAmount
> property: hasRecipient
> property: hasDuration
> property: hasActor
> property: type
> res:http://www.people.lu.unisi.ch/fornaran/example/promise#book1
> property: type
> res:http://www.people.lu.unisi.ch/fornaran/example/promise#MaryAction1
> property: hasObject
> property: hasRecipient
> property: hasActor
> property: type
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Objects>>>>>>>>>>>>>>>>>>>>>>>
>
> nod:http://www.people.lu.unisi.ch/fornaran/schemas/app-rdf0#Pay : true
> res:http://www.people.lu.unisi.ch/fornaran/schemas/app-rdf0#Pay : Pay
> nod:http://www.people.lu.unisi.ch/fornaran/schemas/app-rdf0#Deliver :
> true
> res:http://www.people.lu.unisi.ch/fornaran/schemas/app-rdf0#Deliver :
> Deliver
> nod:Mary : false
> nod:2 : false
> nod:http://www.people.lu.unisi.ch/fornaran/example/promise#book1 : true
> res:http://www.people.lu.unisi.ch/fornaran/example/promise#book1 : book1
> nod:John : false
> nod:http://www.people.lu.unisi.ch/fornaran/schemas/app-rdf0#book : true
> res:http://www.people.lu.unisi.ch/fornaran/schemas/app-rdf0#book : book
> nod:5 : false
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