Basics of XML Schema inheritance

Hello All,

I have a simple SOAP message for which I would like to define a XML Schema. 
This SOAP message has just 2 elements.

Could any of you please help me out on this one?

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/";>
                <CPG-ENV:SenderID 
xmlns:CPG-ENV="http://www.cpgmarket.com/soap/";>9999998000</CPG-ENV:CPGSenderID>
<SOAP-ENV:Body>
                <CPG-ENV:DocumentID 
xmlns:CPG-ENV="http://www.cpgmarket.com/soap/";>Z2030000000000436060</CPG-ENV: 
DocumentID>
</SOAP-ENV:Envelope>

I have defined an XML Schema based on my understanding, which goes like this

<?xml version="1.0"?>
<xsd:schema targetNamespace="http://schemas.xmlsoap.org/soap/envelope/"; 
xmlns:cpg="http://www.cpgmarket.com/soap/"; 
xmlns:tns="http://schemas.xmlsoap.org/soap/envelope/"; 
xmlns:xsd="http://www.w3.org/2001/XMLSchema";>
        <xsd:redefine 
schemaLocation="http://schemas.xmlsoap.org/soap/envelope/";>
                <xsd:complexType name="Header">
                        <xsd:complexContent>
                                <xsd:extension base="Header">
                                        <xsd:sequence>
                                                <xsd:element name="SenderID" 
minOccurs="0"/>
                                        </xsd:sequence>
                                </xsd:extension>
                        </xsd:complexContent>
                        <xsd:anyAttribute namespace="##any" 
processContents="lax"/>
                </xsd:complexType>
        </xsd:redefine>
        <xsd:redefine 
schemaLocation="http://schemas.xmlsoap.org/soap/envelope/";>
                <xsd:complexType name="Body">
                        <xsd:complexContent>
                                <xsd:extension base="Body">
                                        <xsd:sequence>
                                                <xsd:element name="DocumentID" 
minOccurs="0"/>
                                        </xsd:sequence>
                                </xsd:extension>
                        </xsd:complexContent>
                        <xsd:anyAttribute namespace="##any" 
processContents="lax"/>
                </xsd:complexType>
        </xsd:redefine>
</xsd:schema>

As you people can guess it does not work.

Any input/suggestions would be highly appreciated.

Regards,

Rajesh


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