David Levy wrote:

I can not find the detail about full XPath support in lxml (I know cElementTree does not)/ I guess it could be easy as it is build on top of libxslt. So can you tell me if xpath expression filtering on attributes and element positions are supported for instance ?

Yes, those should be supported, using 'xpath()' on the tree or any element. Basically anything in libxml2's XPath implementation is supported. Regards, Martijn