Identity-constraint tests Valid test for identity constraint referrals with annotation Valid test for identity constraint referrals Tests unresolvable xpath test attribute which is required as declared in key is abscent Tests for duplication on components with identity constraints Checks that ic referrals works when nested Tests for duplication on components with keys and uniques 3.11.3.4 - If ref is present, then only id and [annotation] are allowed to appear together with ref. 3.11.3.5 - If ref is present, then the {identity-constraint category} of the identity-constraint definition resolved to by the actual value of the ref [attribute] matches the name of the element information item. identity constraints contains no name and no ref attribute key refers to nonexisting key [key] cannot have both ref and name attributes [key] cannot have both ref and name attributes