The document discusses a proposed framework for migrating domain-specific languages. The framework consists of two components: a UML generator that transforms code into UML diagrams based on mapping rules, and a UML extractor that imports general UML and transforms it into two UML diagrams - plain UML and UML with stereotypes and tagged values. The goal of the framework is to make models more understandable than code and easier to find differences between versions when migrating domain-specific languages.