xs itempsvi validity_notknown validity_invalid validity_valid validation_none validation_partial validation_full getvalidationcontext getvalidity getvalidationattempted geterrorcodes geterrormessages getschemanormalizedvalue getactualnormalizedvalue xsexception getactualnormalizedvaluetype xsexception getitemvaluetypes xsexception xsvalue getschemavalue xstypedefinition gettypedefinition xssimpletypedefinition getmembertypedefinition getschemadefault getisschemaspecified