Summary
In this chapter, we implemented a DSL for expressions. This allowed us to explore some techniques for dealing with recursive grammar rule definitions in Xtext grammars and some simple type checking. We also showed how to write an interpreter for an Xtext DSL.
In the next chapter, we will develop a small object-oriented DSL. We will use this DSL to show some advanced type checking techniques that deal with object-oriented features such as inheritance and subtyping (type conformance).
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