WSDL, as the name suggests, is only a description of what is available for you to use. If you are using a higher level language like C# or Java, you can create a class from this WSDL, create an instance of this class and then you will be able to use the methods and properties of this class.
 
If you just want to deal with XML, you can create an XML SOAP request and send it as a whole to the CUCM server. It's a bit tedious for me and that is why I tend to make a class of the WSDL use it that way.
 
Hope this helps,
 
Thanks,
Max

See the attached file for a get_file_list sample, including HTTP headers.  Note this must be posted via HTTPS/SSL.
However, the CDRonDemand web service is NOT going to work as a general mechanism/transport for getting CDR files to your application.  CDRoD requests are limited to (10 per minute?) and can only request one file at a time.
It is HIGHLY recommended that bulk CDR billing applications use the FTP delivery mechanism built into UCM to receive these files (see the Serviceability web pages.)  CDRoD should be used only to casually check the occasional single file.

Looks like xsd:boolean should be lowercase: true
 
http://books.xmlschemata.org/relaxng/ch19-77025.html