SQL Server Reporting Services 2008 R2 introduces the RDL 2010 format with enhancements such as Maps, shared dataset references, page breaks , as well as RDL expression language additions such as Lookup, and aggregates of aggregates.
We also published Open Specification Documentation for several Reporting Services technologies; most importantly:
- [MS-RDL] Report Definition Language (RDL) File Format Structure Specification
- [MS-RPL] Report Page Layout (RPL) Binary Stream Format Structure Specification
- [MS-RGDI] Remote GDI+ (RGDI) Binary Stream Format Structure Specification