code: def log_url (self, url_data):
          
          node = self.get_node(url_data)
          if node:
              self.writeln(u"  node [")
              self.writeln(u"    id     %d" % node["id"])
              self.writeln(u'    label  "%s"' % node["label"])
              if self.has_part("realurl"):
                  self.writeln(u'    url  "%s"' % node["url"])
              if node["dltime"] >= 0 and self.has_part("dltime"):
                  self.writeln(u"    dltime %d" % node["dltime"])
              if node["size"] >= 0 and self.has_part("dlsize"):
                  self.writeln(u"    size %d" % node["size"])
              if node["checktime"] and self.has_part("checktime"):
                  self.writeln(u"    checktime %d" % node["checktime"])
              if self.has_part("extern"):
                  self.writeln(u"    extern %d" % node["extern"])
              self.writeln(u"  ]")
docs: Write one node.