code: def serialized (self, sep=os.linesep):
          
          return unicode_safe(sep).join([
              u"%s link" % self.scheme,
              u"base_url=%r" % self.base_url,
              u"parent_url=%r" % self.parent_url,
              u"base_ref=%r" % self.base_ref,
              u"recursion_level=%d" % self.recursion_level,
              u"url_connection=%s" % self.url_connection,
              u"line=%d" % self.line,
              u"column=%d" % self.column,
              u"page=%d" % self.page,
              u"name=%r" % self.name,
              u"anchor=%r" % self.anchor,
              u"cache_url=%s" % self.cache_url,
             ])
docs: Return serialized url check data as unicode string.