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There are a number of "simple" APIs out there, such as
Fredrik Lundh's ElementTree and Greg Stein's qp_xml,
although this is the only one with the notion of a document
type.

I would encourage to contribute it to PyXML first; it is not
clear (to me) that this is somehow a "right" way to do XML
processing. For example, it seems limited in the structure
of XML content models supported (e.g. no mixed content, no
support for preserving the order of child elements). It
might be confusing to users if their seemingly simple
documents are not properly supported.