Base class for all Traversals
http://www.w3.org/TR/rdf-mt/#RDFRules (7.3 RDFS Entailment Rules)
OWL usage of rdfs:domain, rdfs:range, and Extensional Entailment Rules *could* provide some optimizations via
inference, when evaluating traversal expressions, they could also implement *some* RDFS entailment rules
by providing additional checks when evaluating traversals.
Methods