Since WSDL files are already XML files, I’m not sure what you are trying to accomplish.
A WSDL file describes a Service (capital ‘S’ used to differentiate between an IS Flow or java “service” which is more like a method or function).
Services contain operations. Each operation accepts one message and (usually) returns one message. Each message may have one or more message parts. Message parts are described using XML schemas that are either imported or that are provided “inline” in the types section.
You can use a variety of client tools to generate code to invoke one or more operations described in the WSDL. Each java-based SOAP stack usually has a utility called WSDL2Java to to this. .Net language code can be generated using the “wsdl.exe” utility provided with the .Net Framework Tools In webMethods Developer you create a “Web Service Connector” to generate a starter Flow service (WSDL2Flow).
Given all that, what is it that you want to do with your WSDL files? How were your WSDL files created? Were they generated from some application server or COTS package?