Frame f = getTermFrame((OWLClass) sub);
if (sup instanceof OWLClass) {
Clause c = new Clause(OboFormatTag.TAG_IS_A.getTag());
c.setValue(getIdentifier(sup));
c.setQualifierValues(qvs);
f.addClause(c);
addQualifiers(c, ax.getAnnotations());
} else if (sup instanceof OWLObjectCardinalityRestriction) {
// OWLObjectExactCardinality
// OWLObjectMinCardinality
// OWLObjectMaxCardinality