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lxml.etree versus ElementTree
http://codespeak.net/lxml/compatibility.html

APIs specific to lxml
http://codespeak.net/lxml/api.html

Extension functions for XPath and XSLT
http://codespeak.net/lxml/extensions.html

The public C-API of lxml.etree
http://codespeak.net/lxml/capi.html

Sax support
http://codespeak.net/lxml/sax.html