C# Self-hosted web service: publish XML schema data structure?

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C#

DevExpress

webservice

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I made a self-hosted web service in c# and everything works fine.

I work on this base Object class (DevExpress XPO):

[Persistent(System.StatusTable)]
public class XPStatusTable : XPBaseObject
{
    private short fIDTable;
    [Key(true)]
    public short IDTable
    {
        get { return fIDTable; }
        set { SetPropertyValue<short>("IDTable", ref fIDTable, value); }
    }

    private string fDescription;
    public string Description
    {
        get { return fDescription; }
        set { SetPropertyValue<string>("Description", ref fDescription, value); }
    }

    public XPStatusTable() { }
    public XPStatusTable(Session session) : base(session) { }
}

I serialize a collection of these objects:

private string GetSerializedData()
{
    StringWriter streamWriter = new StringWriter();
    using (UnitOfWork uow = new UnitOfWork())
    {
        XmlSerializer xmlSerializer = new XmlSerializer(typeof(XPCollection<XPStatusTable>));
        XPCollection<XPStatusTable> list = new XPCollection<XPStatusTable>(uow);
        xmlSerializer.Serialize(streamWriter, list);

        return streamWriter.ToString();
    }
}

The Service interface has got this function that return a string, but the string is a xml file with XPStatusTable schema..

[OperationContract]
string GetSerializedData();

Is there a way to publish in wsdl descriptor (or I don't know where) that 'GetSerializedData' return a collection of XPSatusTable instead a simple string?