code: def rfc2426(self):
          
          if self.uri:
              return rfc2425encode(self.name,self.uri,{"value":"uri"})
          elif self.sound:
              return rfc2425encode(self.name,self.sound)
docs: RFC2426-encode the field content.
  
          :return: the field in the RFC 2426 format.
          :returntype: `str`