This is a prototype of MELD in Prolog. For a full description, check: A Language for Large Ensembles of Independently Executing Nodes, Michael P. Ashley-Rollman, Peter Lee, Seth Copen Goldstein, Padmanabhan Pillai, and Jason D. Campbell. In Proceedings of the International Conference on Logic Programming (ICLP '09), July, 2009. Meld: A Declarative Approach to Programming Ensembles. Michael P. Ashley-Rollman, Seth Copen Goldstein, Peter Lee, Todd C. Mowry, and Padmanabhan Pillai. In Proceedings of the IEEE International Conference on Intelligent Robots and Systems (IROS '07), October, 2007. Supported: - basic semantics - aggregates - updates - delete Unsupported: - distributed execution :)