PHP5 - SOAP extension and WSDL generation

Hi there, I'm trying to find out how to generate a WSDL with the functions I am providing as web services, and I'm finding various posts on the net that say it's not possible with the SOAP extension built in PHP5. At the same time, I find that http://www.php.net/manual/en/soap.constants.php lists four constants that have to do with WSDL caching: WSDL_CACHE_NONE (integer) WSDL_CACHE_DISK (integer) WSDL_CACHE_MEMORY (integer) WSDL_CACHE_BOTH (integer) which apparently are only used in the http://www.php.net/manual/en/soapserver.soapserver.php method. so I'm a bit confused about the lack of info there. Why would the extension not include a WSDL-generation method for one given server object while other libraries (NuSOAP and PEAR::SOAP) do? Isn't that kind of pushing users away from the core extension? I mean, generating a WSDL is not a funny job, but many services will need one and a developer doesn't want to be updating his at every change he makes in his service function, does he? Thank you, Yannick