- [semidet]rdf_is_resource(@Term)
- True if Term is an RDF resource. Note that this is merely a 
type-test; it does not mean this resource is involved in any triple. 
Blank nodes are also considered resources.
- See also
- rdf_is_bnode/1
 
- rdf_is_bnode(+Id)
- Tests if a resource is a blank node (i.e. is an anonymous resource). A 
blank node is represented as an atom that starts with _:. 
For backward compatibility reason,__is also considered to 
be a blank node.
- See also
- rdf_bnode/1.
 
- [semidet]rdf_is_literal(@Term)
- True if Term is an RDF literal object. Currently only checks 
for groundness and the literal functor.