Perhaps I missed the point too, but the way I understand the post is that it's demonstrating how to parse DDLs so that a model (AST) of the actions and structur

Perhaps I missed the point too, but the way I understand the post is that it's demonstrating how to parse DDLs so that a model (AST) of the actions and structures can be extracted. From there an implementation can be defined to create, alter, drop, etc the respective objects and then probably update some kind of manifest that represents the objects and potentially its relationship to others. In most databases that manifest is the INFORMATION_SCHEMA.