How to call function which not in built-in function from rule

[Nuttapon Sanyawong]

Is there a way to call function which not in built-in function from rule
like

[rdfs2:  (?x ?p ?y), (?p rdfs:domain *(new JavaForms.frmAskMethod)*)
-> (?x rdf:type ?c)]

Thanks in advance,

Nuttapon