1. OMG Model Driven Architecture (http://www.omg.org/mda)
2. OMG Meta Object Facility Core Specification. Version 2.5.1. (http://www.omg.org/spec/MOF/2.5.1)
3. OMG Unified Modelling Language UML. Version 2.5 (http://www.omg.org/spec/UML/2.5)
4. XML Metadata Interchange (XMI) Specification. Version 2.4.2 (http://www.omg.org/spec/XMI/2.4.2)