duplicate global elements and refs

dexter62 · December 8th, 2009, 09:06 AM

Say I have a duplicate global element A using two different definitions:

Code:

    
<xsd:complexType name="AType">
      <xsd:sequence>
    	<xsd:element name="first" type="xsd:string"/>
      </xsd:sequence>
    </xsd:complexType>
    

    <xsd:complexType name="CType">
    <xsd:complexContent>
      <xsd:extension base="BType">
      <xsd:sequence>
    	<xsd:element name="third" type="xsd:string"/>
      </xsd:sequence>
      </xsd:extension>
    </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="A" type="AType" />
    <xsd:element name="A" type="xsd:string" />
    
    <xsd:element name="B" substitutionGroup="A">
        <xsd:complexType>
		    <xsd:complexContent>
   		 	  <xsd:extension base="AType">
		      <xsd:sequence>
 		   		<xsd:element name="second" type="xsd:string"/>
		      </xsd:sequence>
		      </xsd:extension>
		    </xsd:complexContent>
	    </xsd:complexType>
    </xsd:element>
    
    <xsd:element name="C" substitutionGroup="B" type="CType" />
    
    <xsd:element name="container">
    <xsd:complexType>
      <xsd:sequence>
    	<xsd:element ref="A" minOccurs="0" maxOccurs="unbounded"/>
      </xsd:sequence>
    </xsd:complexType>
    </xsd:element>

As you can see A, B and C are supposed to be in a tree of which A is root. The container referencing A accepts either type. However this would of course be the case if the second definition of A

Code:

<xsd:element name="A" type="xsd:string" />

wouldn't be there.

1: is this legal at all (i.e. the global duplicate element)
2: if 1:YES - How can the ref="A" be resolved?

Thanks for the advice.

mhkay · December 8th, 2009, 11:09 AM

No, it's not legal. You can only have one global element with a given name. The other would have to be local.

dexter62 · December 8th, 2009, 11:36 AM

I hoped for this answer. Otherwise it would have been utterly complicated..