Attribute type mismatch.
          #6002   Run-time catchable error
          Attribute type mismatch.
Additional Information
 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".
Explanation
An element's attribute declared type must match the type expected
by the OmniMark program.