Yes, it is possible to create your own EMF model and to use it in your dialogue application. One important point is that your new model inherits from some of the SiAM-dp base concepts, e.g. from base:Entity for new concepts describing entities that can be used as semantic content. There are some good tutorials in the internet about EMF model generation. For the use during runtime you need to generate model code (here), for the use in the sdk and in editors you also need edit code (here). Editor code is not necessary.← Can I create and add my own domain specific model?