def addTrackback(self, url, title, excerpt, blog_name):
        """Add a trackback line to this entry.

        The passed variable can be the request containing the trackback
        information or a dict with the appropriate trackback keys.
        """

        added = DateTime.DateTime()
        s = '|'.join((url, title, excerpt, blog_name, str(added)))

        current_trackback = self.getTrackbackPings()

        updated_trackback = []
        for line in current_trackback:
            updated_trackback.append(line)

        updated_trackback.append(s)

        self.setTrackbackPings(updated_trackback)

        return True
	~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    def getWeblogCategories(self):
        """Return a list of the Categories this Entry is assigned"""

        result = DisplayList()

        weblog = self.quills_tool.getParentWeblog(self)

        #topics = self.quills_tool.getWeblogTopics(weblog)
        topics = weblog.getTopics()

        for topic in topics:
            result.add(topic.getId(), topic.Title())

        return result