怎么把客户端从webservice获得的xml转换成recordset？

如题。
webService的函数如下：
VB.NET code:

Public Function RecordSetBySql(ByVal Sql As String) As XmlDataDocument
Dim xRs As ADODB.Recordset
Dim cmd As ADODB.Command
Dim st As Stream
Dim xd As XmlDataDocument

xRs = New ADODB.Recordset
cmd = New ADODB.Command
st = New Stream
xd = New XmlDataDocument

xRs.Open(Sql, SDConn, CursorTypeEnum.adOpenDynamic, LockTypeEnum.adLockOptimistic)
xRs.Save(st, PersistFormatEnum.adPersistXML)
st.Flush()
st.Position = 0
xd.LoadXml(st.ReadText(st.Size))
st.Close()
xRs.Close()
conn.Close()

Return xd

End Function

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