UPA or not UPA violation?

  Hi

  Considering the following schema:

    <xs:group name="g1">
       <xs:sequence>
          <xs:element name="a" type="xs:int" minOccurs="0"/>
          <xs:element name="b" type="xs:int" minOccurs="0"/>
       </xs:sequence>
    </xs:group>

    <xs:group name="g2">
       <xs:sequence>
          <xs:element name="c" type="xs:int" minOccurs="0"/>
          <xs:element name="d" type="xs:int" minOccurs="0"/>
       </xs:sequence>
    </xs:group>

    <xs:element name="elem">
       <xs:complexType>
          <xs:sequence>
             <xs:choice>
                <xs:group ref="g1"/>
                <xs:group ref="g2"/>
             </xs:choice>
          </xs:sequence>
       </xs:complexType>
    </xs:element>

  Should it be an UPA violation if we have an "elem" element with no
child?  Because in this case we know the content of the element is
either of the groups but we don't know which one (because both can be
empty).

  Or I missed something?

  Regards,

--drkm

























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