typeinfoisderivedfrom63
IBM
The isDerivedFrom method checks if this TypeInfo derives from the specified ancestor type.
If the document's schema is a DTD or no schema is associated with the document, this method
will always return false.
Get schemaTypeInfo on an element that belongs to a document with an XML DTD. Invoke method
isDerivedFrom and verify that returned the typeNamespace is null.
Jenny Hsu
2003-10-10