 But of course, it's not just about new concepts It's also about having a good look at the standard again from the perspective of usability from perspective structure And one of the things we also added to the standard for those of you who've downloaded the book that you might already have noticed That we start off in a different way by showing how the standard builds up from models and concepts and elements So we have added an upper-level Generic metamodel to describe the structure of the standard and this is just one picture out of that Generic description showing how this this language is built up. So a model consists of concepts We have three different kinds of concepts elements Relationships and then relationship connectors, which are a special kind and then these elements are subdivided again into behavior elements structure elements motivation elements and composite elements And then you can go down structure elements We have passive and active structure elements, etc. And this is this regular structure is now explained in the standard in a much better way So that's for the the framework of the standard and for the structure So that's being improved as well It also helps people who want to implement the language because they have the background now and they can find it in there