Report Definition Language
SQL Server 2005
A report definition contains data retrieval and layout information for a report. Report Definition Language (RDL) is an XML representation of this report definition. RDL is an open schema; developers can extend RDL with additional attributes and elements.
The standard file extension for report definition files is .rdl. Its MIME type is text/xml.
Concepts
Generating Report Definition Language ProgrammaticallyOther Resources
Reporting Services ProgrammingUsing Custom Assemblies with Reports