'Renders annotatable content with annotation spans and returns HTML.'

def _render_content(self):

    xmltree = etree.fromstring(self.content)
    xmltree.tag = 'div'
    if ('display_name' in xmltree.attrib):
        del xmltree.attrib['display_name']
    index = 0
    for el in xmltree.findall('.//annotation'):
        self._render_annotation(index, el)
        index += 1
    return etree.tostring(xmltree, encoding='unicode')
