This section provides an overview of the BIRT Report Object Model (ROM) and the primary elements that comprise the model. ROM defines the rules for constructing a valid report design file in much the same way that HTML defines the rules for constructing a valid web page. ROM, therefore, is the model for the BIRT report design, template, or library file in the same way that HTML is the model for the web page. For information about every component of ROM, see the online help entry Report Object Model (ROM) Definitions Reference in BIRT Programmer Reference.