'Render as HTML a listing of all known users with links to their
personal resources.'

def render_GET(self, request):

    domImpl = getDOMImplementation()
    newDoc = domImpl.createDocument(None, 'ul', None)
    listing = newDoc.documentElement
    for (link, text) in self._users():
        linkElement = newDoc.createElement('a')
        linkElement.setAttribute('href', (link + '/'))
        textNode = newDoc.createTextNode(text)
        linkElement.appendChild(textNode)
        item = newDoc.createElement('li')
        item.appendChild(linkElement)
        listing.appendChild(item)
    htmlDoc = (self.template % {'users': listing.toxml()})
    return htmlDoc.encode('utf-8')
