frustrated

Can anyone provide an example of getting the list of parameters for a report by using the web services API? If I can somehow get access to a JasperReport object for a report stored in the repository, then I know how to get the information I need. I also know that I can get a ReportUnit resource from the repository, but I don't see any documentation about getting either a JasperReport out of the report unit or getting the report parameters in some other way. Thanks in advance for your help.