Given that they are IE only there are some details here: http://msdn2.microsoft.com/en-us/library/ms535918(VS.85).aspx
You can just use the data as if you'd loaded it into a DomDocument by treating the return value of getElementById("myXmlDataId") as if it were a loaded document, alternatively you can use the XMLDocument property. You can also access it as a recordset, see the URL above.
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Joe (
Microsoft MVP - XML)