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