Hi,
I have a litte problem with an given xml-File. I've got the schema for this 
file and generated an class with xsd.exe.
I have truncated and simlified the files so I hope it's all clear.
The xml-File comes in the format (FILE A)
---------------------------------------------------------------------------
<?xml version="1.0"?>
<MyFile xmlns="http://mynamespace" 
xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance>
    <Application>
        <Reporting xmlns="http://mynamespace/reporting">
            <Text>Fantasy</Text>
        </Reporting>
    </Application>
</MyFile>
---------------------------------------------------------------------------
The xml-schema is defined as#
---------------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="http://mynamespace" 
xmlns:wcr="http://mynamespace/reporting" xmlns="http://mynamespace" 
xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" 
attributeFormDefault="unqualified">
    <xs:import namespace="http://mynamespace/reporting" 
schemaLocation="mynamespace.Reporting.xsd"/>
    <xs:element name="MyFile">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="Application" type="ApplicationElt" 
maxOccurs="unbounded"/>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:complexType name="ApplicationElt">
        <xs:sequence>
            <xs:element ref="Message" minOccurs="0" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>
    <xs:element name="Message" type="MessageBaseElt"/>
    <xs:complexType name="MessageBaseElt" abstract="true"/>
</xs:schema>
---------------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="http://mynamespace/reporting" 
xmlns:wcb="http://mynamespace" xmlns="http://mynamespace/reporting" 
xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" 
attributeFormDefault="unqualified">
    <xs:import namespace="http://mynamespace" 
schemaLocation="mynamespace.xsd"/>
    <xs:complexType name="ReportingMessageElt">
        <xs:complexContent>
            <xs:extension base="wcb:MessageBaseElt">
                <xs:sequence>
                    <xs:element name="Text" type="xs:string"/>
                </xs:sequence>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>
    <xs:element name="Reporting" type="ReportingMessageElt" 
substitutionGroup="wcb:Message"/>
</xs:schema>
---------------------------------------------------------------------------
If I try to serialize this class the file that is generatet looks like (FILE 
B)
---------------------------------------------------------------------------
<?xml version="1.0"?>
<MyFile xmlns="http://mynamespace" 
xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance>
    <Application>
        <Reporting xmlns:q1="http://mynamespace/reporting">
            <q1:Text>Fantasy</q1:Text>
        </Reporting>
    </Application>
</MyFile>
---------------------------------------------------------------------------
I tested both files with 3 different xml Validators and all files are valid.
However when deserializing FILE B all works well and after MyFile x = 
(MyFile)serial.Deserialize(fs);
x.Application[0].Message[0] holds an Reporting object with the data.
When deserializing FILE A x.Application[0].Message is null and no exception 
is raised that gives an hint to the Problem.

Did I do something wrong?

Just do be sure. There is nothing I can do about the xml-File (FILE A) so I 
have to get this to work with changes in the generated class or the 
xml-Schema.

Thanks
Michael