Flex :: XmlSchemaProviderAttribute And Xsd:import?

We're using a custom class that uses XmlSchemaProviderAttribute in order to make it seem like a string. It is declared as follows:

[XmlSchemaProvider("GetSchema")]
public sealed class CDataWrapper : IXmlSerializable
{[code]......

The CDataWrapper class is taken from this question. We're using it since one of our clients (a FLEX client) cannot read leading railing spaces correctly. And we're making it seem like a string in the schema, in order not to break the contract with our other clients. This works nicely, usually, but one of our clients is unable to generate a proxy with the schema that WCF creates for the service that uses the above wrapper class. We've traced the reason to this line in our wsdl:

<xsd:import schemaLocation="http:[url]....

And its content is:

<?xml version="1.0" encoding="utf-8" ?>
- <xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="string" nillable="true" type="xs:string" />
</xs:schema>

The problem is that there is no namespace attribute on the xsd:import element above, and our client's proxy generator can't handle that well.In short, how can we add the namespace attribute to the generated wsdl?