XML Metadata Interchange Reference - A complete reference which can be downloaded for off-line use, by Zvon. UML 1.4 Diagram Reference - UML 1.4 Diagrams as quick reference in PDF Format. Smart Development Environment Users Guide - Smart Development Environment (SDE) is UML modeling plug-in seamlessly integrated with most of the leading IDEs in the market. UML 1.1 Extension for Business Modeling - Defines UML extensions for business modeling, by Rational. UML 1.1 Notation Guide - Defines the UML notation and provides examples, by Rational. UML 1.1 Summary - An introduction to the UML that provides a road map to the other documents, by Rational. UML 1.1 Semantics - Defines UML in terms of its abstract syntax presented in class diagrams, formal well-formedness rules expressed in OCL, and semantics expressed in text, by Rational.