How to get the WSDL of a ruby web service

hi,
i followed a article at the following URL and implemented both the
service and client.
http://www.devx.com/enterprise/Article/28101/0/page/4

the service was deployed successfully and works fine.I used following
library.
soap/rpc/standaloneserver

now i want to get WSDL for this service. I appreciate if you can help me
with this.

thanks!

buddhika