Per Jena rule syntax and structure, I can use builtin primitives in the
rule.
*term* := (*node*, *node*, *node*) // triple pattern
or (*node*, *node*, *functor*) // extended triple pattern
or builtin(*node*, … *node*) // invoke procedural primitive
I have tried the following built-ins, but none of them could be triggered.
[ test1: makeTemp(?x) -> print("makeTemp test") ]
[ test1: unbound(?x) -> print("unbound test") ]
[ test1: bound(?x) -> print("bound test") ]
[ test1: now(?x) -> print("now test") ]
However, if I added one triple ahead as below. It works.
[ test1: (:User rdf:type ?y) makeTemp(?x) -> print("makeTemp test") ]
Where :User is an individual in the system.
