Xml Datasource For Reporting Services

help pls - pulling hair out on this one

am doing proof-of-concept for reporting services reports getting data via web services.

got it working for simple examples (passing back strings etc)
also woking passing back an object
but cant get it working with a dataset - am having trouble filtering out the XML resultset


this is my webmethod
[WebMethod]
public DataSet DSetExample()
{
DataSet ds = new DataSet("XMLTest");
DataTable dt = new DataTable();
DataColumn dc;
dc = new DataColumn("IntegerColumn1", System.Type.GetType("System.Int32"));
dt.Columns.Add(dc);
dc = new DataColumn("StringColumn1", System.Type.GetType("System.String"));
dt.Columns.Add(dc);
dc = new DataColumn("DecimalColumn1", System.Type.GetType("System.Decimal"));
dt.Columns.Add(dc);
dc = new DataColumn("DateTimeColumn1", System.Type.GetType("System.DateTime"));
dt.Columns.Add(dc);
DataRow drow = dt.NewRow();
drow["IntegerColumn1"] = 1;
drow["StringColumn1"] = "WTF";
drow["DecimalColumn1"] = 205.299;
drow["DateTimeColumn1"] = DateTime.Parse("22/May/1966");
dt.Rows.Add(drow);
ds.Tables.Add(dt);
return ds;
}

this is my basic query
<Query>
<ElementPath IgnoreNamespaces="true">*
</ElementPath>
<Method Name="DSetExample" Namespace="http://localhost/testservice1">
</Method>
</Query>

this just gives me the first node details

but when ever i try and specify the elements i want by using the ElementPath
nothing comes back....

just need to know how to specfiy the ELEMENTPATH to return the dataset details...

thx