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The active operations approach enables incremental evaluation of OCL-like expressions, and can also be used to implement incremental model transformation. Each active operation corresponds to a basic building block such as select, or collect, and encapsulates both its initial computation algorithm as well as its change propagation algorithms. Complex operations such as groupBy can generally be expressed using simpler operations such as select and collect, but have better performance with andblp:conf/models/JouaultC18 fatcat:nnj3taybs5fbrafjngp7g4whbe