code: def url_to_path(self, url):
          
          parts = urlsplit(url)
          try:
              loader, args = self.url_map.bind(parts.netloc).match(parts.path)
              path = args.get('path')
              if loader == 'schema' and path in self.schemas:
                  return path
          except HTTPException:
              return None
docs: Convert schema URL to path.
  
          :param url: The schema URL.
          :returns: The schema path or ``None`` if the schema can't be resolved.