Hi Tim,
such operations are possible in principle, but you need to be careful
not to cause side effects. In the example below, the body of the WHERE
clauses will be rdf:Lists. While you can introduce another query that
points to the same RDF nodes (rdf:List items), you would need to modify
the first list so that it continues with the second list. Once you
modify one, then the original query will change its meaning too.
You could however create an RDF structure such as
SELECT * {
{
?s rdfs:label ?label .
}
{
?s a ex:Car .
}
}
using SPARQL INSERTs and CONSTRUCTs. We have done similar things in the
past. Making a deep copy of the RDF nodes would be better to avoid clashes.
HTH
Holger
On 1/15/2014 6:07, Tim Harsch wrote:
I'm wondering if I can use TBC to store a query (as RDF) can I then
use TBC library functions or SPIN functions or SPIN API (ie via some
Java code) to merge queries?
ie
Say I have two queries and I already know how I want to merge them (a
specific case), like:
SELECT * {
?s rdfs:label ?label .
}
and
SELECT * {
?s a ex:Car .
}
and I want to merge these two queries into:
SELECT * {
?s rdfs:label ?label .
?s a ex:Car .
}
Thanks,
Tim
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