RIF-PRD XSD violates UPA

Hi,

I'm not sure if this is the right list to write my issue. But as long as it
associates with developing I thought public-rif-dev would be appropriate.

Have anyone tried to generate java classes from RIF-PRD xml schema [1]?
When I try to do it I fail with the unique particle attribution rule [2]
violated. Here is what xjc (the JAXB binding compiler) says to me:

-----

> \>xjc .\PRD.xsd -d .
> parsing a schema...
> [ERROR] cos-nonambig: "http://www.w3.org/2007/rif#":Const and "
> http://www.w3.org/2007/rif#":Const (or elements from their substitution
> group) violate "Unique Particle Attribution". During validation against
> this schema, ambiguity would be created for those two particles.
> line 567 of file:/D:/(...)/PRD.xsd
> Failed to parse a schema.

----

My solution to that is changing Retract element definition.

In original schema we have (lines 567-578):
               <xs:complexType>
                  <xs:choice>
                     <xs:element ref="Atom"/>
                     <xs:element ref="Frame"/>
                     <xs:group ref="TERM"/>
                     <xs:sequence>
                        <xs:group ref="TERM"/>
                        <xs:group ref="TERM"/>
                     </xs:sequence>
                  </xs:choice>
                  <xs:attribute name="ordered" type="xs:string"
fixed="yes"/>
               </xs:complexType>

My proposition of changing schema:
               <xs:complexType>
                  <xs:choice>
                     <xs:element ref="Atom"/>
                     <xs:element ref="Frame"/>
                     <xs:group ref="TERM" minOccurs="1" maxOccurs="2"/>
                  </xs:choice>
                  <xs:attribute name="ordered" type="xs:string"
fixed="yes"/>
               </xs:complexType>

Second version works fine and I think means the same.

What do you think? Does the fix look good for you?

Cheers,
Aleksander Bartnikiewicz

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[1] - http://www.w3.org/2010/rif-schema/prd/PRD.xsd
[2] - http://en.wikipedia.org/wiki/Unique_Particle_Attribution