WSDL

Glue for object serialization. Helps programming languages interface smoothly with SOAP end-points.

  use SOAP::Lite; 
  my $weatherService = SOAP::Lite->service('http://www.xmethods.net/sd/TemperatureService.wsdl');
  print $weatherService->getTemp('02451');

Without WSDL, programmers may need to give all the parameter data-types and XML element tags.