A model can be represented graphically and textually. While text is able to carry more detailed information, a diagram highlights the relationship between elements much better. In the end, a good tool should combine both, and use each notation where it suits best.
Xtext and Sirius are both based on the Eclipse Modeling Framework (EMF) and as such combinable. But once you have the most basic integration running you will stumble across strange issues. Getting rid of these requires a deeper understanding on how both frameworks treat their models and a clear vision on what you want to achieve.
In this talk we will outline several integration scenarios. As a joint talk of Obeo and TypeFox, we will explain the typical issues from the Sirius and the Xtext perspective and show how to tackle them to create great hybrid modelling tools in the end.