Hi,
I'm having a few problems with getting results from a query that I have
defined:
session.executeCommand("(defquery all-triples " +
"(declare (variables ?sub))" +
"(triple (predicate ?pred)" +
"(subject ?sub)" +
"(object ?obj)))");
I want to get all the predicates and objects for one particular subject:
Iterator res = session.runQuery("all-triples",
new ValueVector().add(new Value("http://grid.cx/provenance/thesis#doc";,
RU.STRING)));
This particular subject has 13 triples (orginally RDF) associated with
it, however, Jess prints the first 6 triples, then raises a
NoSuchElementException. I loop through the result like this:
try {
while (res.hasNext())
{
Token token = (Token) res.next();
System.out.println(res.next());
}
} catch (NoSuchElementException ex) {
System.out.println("No such element!");
}
I can successfully retrieve all the triples in working memory using:
(defquery all-triples (triple))
then running:
Iterator res = session.runQuery("all-triples", new ValueVector());
which doesn't throw any exception.
Is it possible that my defquery is wrong? I originally wanted to use two
variables to search for the subject using the predicate and object. I
have not successfully done this yet, because I am uncertain how to add
additional variables to the defquery.
Regards,
Rowland Watkins
Declarative Systems & Software Engineering Group,
University of Southampton,
Southampton,
SO17 1BJ
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