Interop .net

[dev]

Hi all,

Our wsdl consists of a lot of string with restriction like:

        <message name="checkCardNumber">
                <part name="cardnumber" type="cardNumberType"/>
        </message>


        <xsd:simpleType name="cardNumberType">
                <xsd:restriction base="xsd:string">
                        <xsd:pattern value="CARDNS[0-9]{10}"/>
                </xsd:restriction>
        </xsd:simpleType>

One partner tries to call our WS with a .NET platform. When he imports our WSDL inside 
its .NET environment, the type
CheckCardNumber is not generated. Our partner says that it is due to the fact that 
.NET does not inherits from a String. 
Can any one confirm this fact that .NET does not support restriction on simpleType or 
our partner has misunderstood something?

Thanks.