Hi! Just to share what I am currently seeing while attending a conference on Model transformation. People seems to enjoy the select and collect operations for sets in OCL. For example, this is what I see on a projected slide: context CD:Class def allSuperclasses: self.parents->union(self.superclasses->collect(c | c.allSuperclasses)->flatten()) Apparently, the fact that you can combine these constructs is innovative... Maybe in the future, we should try to target ICMT and other model-like conference. Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.