Can't load Dataset with XML and Schema from another Dataset

I'm trying to pass a dataset as xml from my web service to my web page. My example code is below and gives me a "Root element is missing" error.

Here's my code behind:

' This is actually a web service method
Public Function GetDatasetXml(ByRef sXmlSchema As String) As String
    Dim sSQL As String = "SELECT ProductId, Name, Color FROM Product WHERE Color IS NULL"
    Dim ds As New Dataset = DbHelper.OpenDataset(sSQL)

     sXmlSchema = ds.GetXmlSchema()

     return ds.GetXml()
End Function

Public Sub BindMarkup
    Dim sXMLSchema As String = String.Empty
    Dim sXML As String = GetDatasetXml(sXMLSchema)

    Dim readerXMLSchema As XmlReader = XmlReader.Create(New StringReader(sXMLSchema))
    Dim readerXML As New System.IO.StringReader(sXML)

    Dim ds As New DataSet
    ds.ReadXmlSchema(readerXML)
    ds.ReadXml(readerXML, XmlReadMode.ReadSchema)

    Me.rptList.DataSource = ds
    Me.rptList.DataBind()
End Sub

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and my markup:

      <asp:Repeater ID="rptList" runat="server" >
        <ItemTemplate>
             <%# DataBinder.Eval(Container.DataItem, "ProductID")%><br>
             &nbsp;&nbsp;&nbsp;<%# DataBinder.Eval(Container.DataItem, "Name")%><br>
             &nbsp;&nbsp;&nbsp;<%# DataBinder.Eval(Container.DataItem, "Color")%><br>
        </ItemTemplate>
      </asp:Repeater>

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I tried this originally without using the XML Schema but that failed because the Color field is null and caused the repeater to complain the Color field wasn't found. So I know I need the schema but I can't figure out how to get this to work.

Thanks in advance.