RE: [Zope-dev] XMLDocument - Importing XML and assigning IDs to resulting nodes

How do I import an XML document such that the IDs of the resulting nodes is derived from an attribute associated with the source XML tags. Ive tried using <tag id="foo"> but I get the following error: Error Type: Bad Request Error Value: Invalid or duplicate property id Is there a way to do this, or are the nodes of an imported XML file destined to be given cryptic, numbered IDs?