The elementtree Package

Package Contents

ElementTree
ElementPath
ElementInclude
HTMLTreeBuilder
TidyHTMLTreeBuilder
XMLTreeBuilder
SgmlopXMLTreeBuilder
SimpleXMLTreeBuilder
SimpleXMLWriter
TidyTools

Online Resources

Elements and Element Trees (effbot.org)
XPath Support in ElementTree 1.2 (effbot.org)
XInclude Support in ElementTree 1.2 (effbot.org)
Simple XML Processing With elementtree (xml.com)