File with .RML extension contains annotations, markers and other information stored in XML format to be applied to CAD drawing. It also includes information about the project itself – its name, but without version number. RML files are associated with Volo View software supported by Autodesk until year 2009. Those files were used as a means to overlay notes added to the project by reviewers in a form of text marked in red.

AutoCAD software version 2005 supported RML file format. RMLIN, a command line utility whose purpose was importing RML files, offered an option to create separate, self-contained and ready to edit drawing layer called ‘Markup’ which contained notes from reviewers. Currently the function to add commentaries is available through Autodesk software such as Autodesk Design Reviewer, which saves appropriate information in DWF or DWFX file formats along with full information about the project, its version and related files.