The WSDL (WebService Description Language) is the XML-based interface description language that is used for describing the functionality offered by a web service. Each Webservice has its own WSDL, and xmlsoccer.com is no exception.
As XMLSoccer.com has two APIs (Demo and full), there are two WSDL's.
Full API WSDL
The full API WSDL can always be found here: http://www.xmlsoccer.com/FootballData.asmx?WSDL
Demo API WSDL
The Demo API WSDL can always be forund here: http://www.xmlsoccer.com/FootballDataDemo.asmx?WSDL