Hello everyone,

I have been trying to "extend" a type which allows xsd:choice model group to add a couple of more allowed choice elements. Here's the original xsd:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns="http://www.w3.org/2001/XMLSchema"
            targetNamespace="http://www.myapp.org/xml/ns/myapp"
            xmlns:myapp="http://www.myapp.org/xml/ns/myapp"
            xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            elementFormDefault="qualified"
            attributeFormDefault="unqualified"
            version="1.0">

   <xsd:element name="graphics" type="graphicsType/>

   <xsd:complexType name="graphicsType">
       <xsd:sequence>
           <xsd:element name="colours" type="coloursType"/>
       </xsd:sequence>
   </xsd:complexType>


   <xsd:complexType name="coloursType">
        <xsd:choice maxOccurs="unbounded">
             <xsd:element name="red">
           <xsd:complexType />
       </xsd:elemen>
       <xsd:element name="blue">
           <xsd:complexType />
       </xsd:element>
       </xsd:choice>
   </xsd:complexType>
</xsd:schema>

The extended xsd is as follows:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns="http://www.w3.org/2001/XMLSchema"
            targetNamespace="http://www.myapp.org/xml/ns/myapp"
            xmlns:myapp="http://www.myapp.org/xml/ns/myapp"
            xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            elementFormDefault="qualified"
            attributeFormDefault="unqualified"
            version="1.0">

   <xsd:element name="extended-graphics" type="extended-graphicsType/>

   <xsd:complexType name="extended-graphicsType">
       <xsd:extension base="graphicsType">
           <xsd:sequence>
               <xsd:element name="brush" type="xsd:string"/>
           </xsd:sequence>
       </xsd:extension>
   </xsd:complexType>

   <xsd:complexType name="more-coloursType" >
       <xsd:extension base="coloursType">
               <xsd:choice maxOccurs="unbounded">
                     <xsd:element name="dark-red">
                   <xsd:complexType />
               </xsd:elemen>
               <xsd:element name="dark-blue">
                   <xsd:complexType />
               </xsd:element>
              </xsd:choice>
       </xsd:extension>
   </xsd:complexType>

</xsd:schema>

So here i have a "coloursType" with a choice of "red" and "blue" and the extended "more-coloursType" has the additional "dark-red" and "dark-blue". Then in my xml i am trying to do this:

<extended-graphics xmlns="http://www.myapp.org/xml/ns/myapp"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:myapp="http://www.myapp.org/xml/ns/myapp">

   <colours xsi:type="more-coloursType">
       <dark-red/>
   </colour>

</extended-graphics>

So in the xml, i am trying to use the extended "more-coloursType" and specifying a "dark-red" value. But this fails validation, with a message saying that "dark-red" is not allowed in this place. It starts working if i first have a normal colour (either red or blue) and then have dark-red:

<colours xsi:type="more-coloursType">
       <blue/>
       <dark-red/>
   </colour>

My understanding was with this kind of extension, with the "choice" elements i would have something like:

(red | blue)* (dark-red | dark-blue)*

but this doesn't seem to be the case. Am i missing something? Are there any changes that i'll have to make to my xsd to allow:

     <colours xsi:type="more-coloursType">
       <dark-red/>
   </colour>

regards,
-Jaikiran

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