LSX-00119 when attempting to register schema

Question

I'm getting an LSX-00119 error trying to register a new revision of an existing schema which registered without any problems:
ORA-31154: invalid XML document
ORA-19202: Error occurred in XML processing
LSX-00119: value is not valid restriction of parent's minLength
ORA-06512: at "XDB.DBMS_XMLSCHEMA_INT", line 0
ORA-06512: at "XDB.DBMS_XMLSCHEMA", line 26
ORA-06512: at line 2
The main changes in the new version are that it uses inheritance between Simple and Complex Types. I think the problem above refers to an instance where the parent type has an attribute of type xs:string with a minLength of 32, and the child type adds a restriction setting minLength to 0:
<xs:simpleType name="PIDClientRefType">
     <xs:restriction base="xs:string">
          <xs:minLength value="32"/>
          <xs:maxLength value="32"/>
     </xs:restriction>
</xs:simpleType>
<xs:element name="PIDClientRef" xdb:SQLName="PIDCLIENTREF">
     <xs:simpleType>
          <xs:restriction base="PIDClientRefType">
               <xs:minLength value="0"/>
          </xs:restriction>
     </xs:simpleType>
</xs:element>
I guess this is counter-intuitive, but XMLSpy didn't have a problem with it! Is this actually invalid and therefore the cause of the problem?
BTW LSX-00119 is the only thing I've ever searched for on Google (and Metalink for that matter) which returned zero results. It's also not documented in the Oracle docs.

Answer 1

Sorry for talking to myself here, but I did the obvious thing and switched the inheritance pattern around so the child now has the more restrictive minLength (32) and the parent the less restrictive (0). The schema now registers in XDB without complaint!