"""
Requirements:

	lxml - python libxml binding

	it needs to installing the following packages before install lxml.

    *  libxml 2.6.21 or later. It can be found here: http://xmlsoft.org/downloads.html
    *  libxslt 1.1.15 or later. It can be found here: http://xmlsoft.org/XSLT/downloads.html
		
	If you use Ubuntu, here is what you need to do.
	
	$ apt-get install libxml2-dev libxslt1-dev
	$ eazy_install lxml
	
"""