'This method is called with the source of each downloaded :term:`HTML` file, before
it is parsed into an object tree. raw_html is a unicode string
representing the raw HTML downloaded from the web. url is the URL from
which the HTML was downloaded.
Note that this method acts *before* preprocess_regexps.
This method must return the processed raw_html as a unicode object.'

def preprocess_raw_html(self, raw_html, url):

    return raw_html
