The modeling language ROOM is not standardized in a strict and formal way but was published in .
 defines a graphical notation which was adopted.
 also contains a textual notation. But this is incomplete and we decided to develop our own notation based on this.
 Bran Selic, Garth Gullekson, Paul T. Ward: Real-Time Object Oriented Modeling, New York: John Wiley, 1994 (ISBN 0-471-59917-4)