'Searches for references on a page. w3af searches references in every
html tag, including "a", "forms", "images", "frames", etc.
Return a tuple containing two sets, one with the parsed URLs, and the
other with the URLs that came out from a regular expression. The
second list is less trustworthy.'

@property
def references(self):

    return ([url for (tag, url) in self._tag_and_url], [])
