Thanks Larry, I appreciate your comment:) And I am glad my post was helpfull!

Hello Meinte, Thanks for your insightful comments:) Yes can't agree more: it is very hard to build a model-driven platform that targets a huge user base. And the big players' success becomes in such a scenario a handicap. At least for the first versions of the platform. So it quite makes sense that small ventures are the leaders in this market. You'll find other feedback on this topic on the model driven software network : http://www.modeldrivensoftware.net/forum/topics/the-new-goldenegg-modeldriven

Hello Vlad, Thanks for your comment;) Well, that should be possible, however becoming tricky. You could potentially find other ways to do what you are trying to achieve. For example what about overriding Equals() in the Role Entity, and returning true when role name is same. and then write your query like this: var r2 = Query.All().Where("Roles.Contains(@0)", new Role() { Name = "admin" }); Will work the same in an neater way:) I haven't tested yet though, you should try. But you get the idea