How to change the xmlns attribute on the root when XmlSerialization?

when serializing xml, of course, default, shows these namespaces below:

<package xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xmlns:xsd="http://www.w3.org/2001/xmlschema"

however, how can change these attribute values "xmlns:xsi" , "xmlns:xsd" following values:

<package xmlns="http://www.wfmc.org/2002/xpdl1.0" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance">

i had at xmlserializernamespaces class , not find clues this.

anyone has ideas?

thanks in advance.

---

justin

with solution should easy change both, xsi , xsd:
/* create xml namespace pairs */
    xmlserializernamespaces namespaces = new xmlserializernamespaces();
    namespaces.add( "yd", "www.diranieh.com" ); // here add xsd namespaces

    /* serialize file */
    stream stream = new filestream( "namespaces.xml", filemode.create, fileaccess.write, fileshare.write );
    xmlserializer serializer = new xmlserializer( typeof( xmlnamespaceserialization.books ) );
    serializer.serialize( stream, books, namespaces );
    stream.close();

source:http://www.diranieh.com/netserialization/xmlserialization.htm

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