[xsd-users] Polymorphism, am I doing something wrong?

[Rob Ursem]

   I've been looking at the polymorphism example and see how that works   , but I can't seem to make my example work.
   Consider the following schema:
   <?xml version="1.0" encoding   <xsd:schema xmlns:xsd="http://www   xmlns:xs="http://www.w3.org/2001/XMLSch   <xs:complexType name="cs_abstractArrayOfPoin   abstract="true">
   <xs:sequence/>
   </xs:complexType>
   <xs:complexType name="cs_pointGeometryPatch&   <xs:sequence>
   <xs:element name="points" type="   minOccurs="1" maxOccurs=&quo   </xs:sequence>
   </xs:complexType>
   <xs:complexType name="cs_arrayOfExplicitPoin   <xs:complexContent>
   <xs:extension base="cs_abstractArrayOfPoints   <xs:sequence>
   <xs:element name="coordinates" type=&   minOccurs="1" maxOccurs="1" /   </xs:sequence>
   </xs:extension>
   </xs:complexContent>
   </xs:complexType>
   <xsd:element name="PointGeometryP   type="cs_pointGeometryPatch"/>
   </xsd:s   In this schema we define a "cs_pointGeometryPatch" type that   element named "points" of type "cs_abstractArrayOfPo   type is an abstract type and for the sake of the example   only one 'implementation' of this abstract class in the schema.
   An example xml for this schema is:
   <?xml version="1.0"?>
   <PointGeometryPatch xmlns:xsi="ht   tp://www.w3.org/2001/XMLSchema-instance"
   xsi:noNamespaceSchemaLocation="points.xsd"   <points xsi:type="cs_arrayOfExplicitPoints3d   <coordinates>3</coordinates>
   </points>
   </PointGeometryPatch>
   In this case a non-abstract class is used for the points element.
   This   wel   The generated code (only hxx shown) is:
   class cs_pointGeometryPatch: public ::xml_s   {
     public:
     // points
     //
     typedef ::cs_abstractArrayOfPoints3d     typedef ::xsd::cxx::tree::traits<   points_traits;
     const points_type&
     points () const;
     points_type&
     points ();
     void
     points (const points_type& x);
     void
     points (::std::auto_ptr< points_t     // Constructors.
     //
     cs_pointGeometryPatch (const points_     cs_pointGeometryPatch (const ::xerce               &               &     cs_pointGeometryPatch (const cs_poin               &               &     virtual cs_pointGeometryPatch*
     _clone (::xml_schema::flags f = 0,             ::xml_sc     virtual
     ~cs_pointGeometryPatch ();
     // Implementation.
     //
     protected:
     void
     parse (::xsd::cxx::xml::dom::parser&            ::xml_sch     protected:
     ::xsd::cxx::tree::one< points_typ   };
   We can see that when we request "points()" from a cs_pointGe   ometryPatch class, we get a reference to points_type, which is the
   abstract   schema, the parse   ayOfExplicitPoints3d" but due to the fact that the accessor for points
   is a reference and not a    the abstract type to a derived    programmatically get to the value 3 (for coordin   shown xml.
   Am I missing something?