1. Dechter, R., Constraint Processing, San Francisco: Morgan Kaufmann, 2003.
2. Buscemia, M.G. and Montanarib, U., A Survey of Constraint-based Programming Paradigms, Computer Science Review, 2008, vol. 2, no. 3, pp. 137–141.
3. ISO 10303: 1994. Industrial Automation Systems and Integration-Product Data Representation and Exchange.
4. OMG Model Driven Architecture: How Systems will be Built. http://www.omg.org/mda .
5. W3C Semantic Web Activity. http://www.w3.org/2001/sw .