Translator for queries as to whether two ground individuals are different-from each other.
This does not have a direct translation in DIG at the moment; instead we ask if the
class expressions formed from the set of each single individual are disjoint.
Translator to map variants of owl:equivalentClass to the DIG <equivalents> query,
where the query is testing if two concepts are indeed equivalent (rather than listing the
atoms that are, in fact, equivalent to a given concept, which is what
DIGQueryEquivalentsTranslator does).