Hi Chi Zhang,
SPARQL functions in general cannot have side effects (such as adding
triples) because that would potentially modify the query results at
execution time. So creating new triples is not possible with SPIN
functions either. If you just want to return multiple values within the
same function (e.g. to query an existing instance), you can use SPIN
magic properties.
Holger
On 28/04/2016 6:23, Chi Zhang wrote:
Hi,
Is it possible to return an instance with some created properties for
it from a SPIN function?
An example like return a vector back from vector cross product function.
RDF file:
inst:vector_1
a geom:Vector ;
geom:x "1.0"^^xsd:double ;
geom:y "1.0"^^xsd:double ;
geom:z "2.0"^^xsd:double .
inst:vector_2
a geom:Vector ;
geom:x "3.5"^^xsd:double ;
geom:y "-1.5"^^xsd:double ;
geom:z "1.5"^^xsd:double .
Is it possible to create a SPIN function, something like cross(v1, v2)
to return a vector instance back with its associated x, y, z?
Thank you very much!
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