code: def do_url_scheme(parser, token):
      
      args = token.split_contents()
      if len(args) != 1:
          raise template.TemplateSyntaxError('%s takes no parameters.' % args[0])
      return OEmbedURLSchemeNode()
docs: Generates a &lt;link&gt; tag with oembed autodiscovery bits.
  
      {% oembed_url_scheme %}