code: def findHTMLMeta(stream):
      
      parser = YadisHTMLParser()
      chunks = []
  
      while 1:
          chunk = stream.read(CHUNK_SIZE)
          if not chunk:
              # End of file
              break
  
          chunks.append(chunk)
          try:
              parser.feed(chunk)
          except HTMLParseError, why:
              # HTML parse error, so bail
              chunks.append(stream.read())
              break
          except ParseDone, why:
              uri = why[0]
              if uri is None:
                  # Parse finished, but we may need the rest of the file
                  chunks.append(stream.read())
                  break
              else:
                  return uri
  
      content = ''.join(chunks)
      raise MetaNotFound(content)
docs: Look for a meta http-equiv tag with the YADIS header name.
  
      @param stream: Source of the html text
      @type stream: Object that implements a read() method that works
          like file.read
  
      @return: The URI from which to fetch the XRDS document
      @rtype: str
  
      @raises MetaNotFound: raised with the content that was
          searched as the first parameter.