Now from the MS page that came from Google I spot this: "Report Definition Language (RDL) is an XML-based schema for defining reports." It doesnt say XML Schema. So I guess no. Unless there is a valid XML Schema somewhere provided. xacc-ide 0.0.15 now with C#, MSIL, C, XML, ASP.NET, Nemerle, MyXaml and HLSL coloring - Screenshots

looks like you can't. read my previous post it seems i've described how to solve that

http://msdn.microsoft.com/library/en-us/RSPROG/htm/rsp_ref_clr_dataproc_8p85.asp?frame=true[^] check that there is also the data processing ext. sample http://msdn.microsoft.com/library/default.asp?url=/library/en-us/RSAMPLES/htm/rss_sampleapps_v1_8spu.asp[^]