I have developed content models on alfresco 4.1.5 and now i tried deploying the same content models in alfresco 4.2 Some of these content models fail to boot up. i have used the same configuration as stated before in alfresco 4.1.5 I am using the Bootstrap method.
Sure, I don't see why that wouldn't work. I assume you would have other content models that would leverage those constraints, otherwise there would not be a point in defining them in the first place.