Correct me if I'm wrong but you mean the Report Definition Language (RDL). I don't know of any dedicated Perl module for this but since RDL is an XML representation of the report definition I assume you can use an XML parser for this job. Look at the MSDN RDL entries for info on the XML side. Look at CPAN for an XML parser. You might want to select something that supports XSLT to do the transformation.