[oXygen-user] duplicate element

[Roderik Dernison]

Hi,

I've created my own extension of DITA. Amongst others I have added an element "predicate", like this:
              <xs:element name="predicate">
                            <xs:annotation>
                                           <xs:documentation>A &lt;predicate> element marks the predicate, e.g. GROOT(Jan). (TP-ELEMENT)</xs:documentation>
                            </xs:annotation>
                            <xs:complexType>
                                           <xs:complexContent>
                                                         <xs:extension base="predicate.class">
                                                                       <xs:attribute ref="class" default="- ling-d/pred "/>
                                                         </xs:extension>
                                           </xs:complexContent>
                            </xs:complexType>
              </xs:element>
              <xs:complexType name="predicate.class" mixed="true"/>

Now when I create a new ling topic, oXygen tells me
E [Xerces] cos-nonambig: predicate and predicate (or elements from their substitution group) violate "Unique Particle Attribution". During validation against this schema, ambiguity would be created for those two particles.

My lingGrp.xsd contains:
              <xs:group name="predicate">
                            <xs:sequence>
                                           <xs:choice>
                                                         <xs:element ref="predicate" />
                                           </xs:choice>
                            </xs:sequence>
              </xs:group>

My lingDomain.xsd contains:
              <xs:group name="ling-d-pred">
                            <xs:choice>
                                           <xs:group ref="predicate" />
                            </xs:choice>
              </xs:group>

And my ling.xsd contains:
              <xs:group ref="ling-d-pred" />

No other references are made to predicate.
What am I doing wrong?

Kind regards,


Ing. Roderik Dernison



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