In computing, UML eXchange Format (UXF) is a XML-based model interchange format for Unified Modeling Language (UML), which is a standard software modeling language. UXF is a structured format described in 1998 and intended to encode, publish, access and exchange UML models.[1]
UMLet is an application that uses UXF as its native file format.
References
^Suzuki, Junichi; Yamamoto, Yoshikazu (1999). "Making UML Models Interoperable with UXF". Selected papers from the First International Workshop on The Unified Modeling Language - UML '98: Beyond the Notation. Association for Computing Machinery. CiteSeerX10.1.1.19.474.