Need help with substitutionGroup

[Vlad Mangeym <ma...@yahoo.com>]

I have the following types:
  
  (Element I am trying to update):
  
      <xs:element name="Apply" type="xacml:ApplyType" substitutionGroup="xacml:Expression"/>
      <xs:complexType name="ApplyType">
          <xs:complexContent>
              <xs:extension base="xacml:ExpressionType">
                  <xs:sequence>
                       <xs:element  ref="xacml:Expression" minOccurs="0" maxOccurs="unbounded"/>
                  </xs:sequence>
                   <xs:attribute name="FunctionId" type="xs:anyURI"  use="required"/>
              </xs:extension>
          </xs:complexContent>
      </xs:complexType>
  
  
  (Element I want to add to it):
  
      <xs:element name="Apply" type="xacml:ApplyType" substitutionGroup="xacml:Expression"/>
      <xs:complexType name="ApplyType">
          <xs:complexContent>
              <xs:extension base="xacml:ExpressionType">
                  <xs:sequence>
                       <xs:element  ref="xacml:Expression" minOccurs="0" maxOccurs="unbounded"/>
                  </xs:sequence>
                   <xs:attribute name="FunctionId" type="xs:anyURI"  use="required"/>
              </xs:extension>
          </xs:complexContent>
      </xs:complexType>
  
  
  I am trying this Java code, but the element still stays as Expression (not AttributeValue):
                  
                //I already have applyXml loaded
          
              ExpressionType exp = null;
              AttributeValueDocument exprDoc = AttributeValueDocument.Factory
                      .newInstance();
              AttributeValueType value = exprDoc.addNewAttributeValue();
              value.setDataType(dataType);
              ((SimpleValue) value).setStringValue("test");
              exp = value;
             
             applyXml.addNewExpression(0);
             applyXml.getExpressionArray()[0].set(exp);
  
  
  Pleas help!
  
		
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