For element 'X': For attribute 'Y', expected type is 'Z' and
received type is 'A'.
where Z is either entity/entities or
entity/entities/notation and A is either
cdata, entity, entities, id, idref,
idrefs, name, names, nmtoken,
nmtokens, number, numbers, nutoken,
nutokens, notation or "Name Group".
An element's attribute declared type must match the type expected
by the OmniMark program.