Differences between 10g and 11g web services

I've gone through the ReportService and ScheduleService wsdls and compared them to the old 10G PublicReportService wsdl.  Maybe I didn't look hard enough, but I don't see many diffrences.

I am able to call the 11G PublicReportService via pl/sql with no issue. I thank Oracle for including backward compatibility here. But when I try and run ScheduleService I get an error relating to the ParameterName:

"org.xml.sax.SAXException: Invalid element in oracle.xdo.webservice.v2.ParamNameValues - item"

Here's a snippet of the code:

p_reportCall_data :=
'<soapenv:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="