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This is called as close to the end of the compile as possible so it can do cleanup work or more usefully it can avoid doing work multiple times. For example if class User.A would modify MyFile.txt normally in the CreateProjection method and class User.B would normally modify the same file when it is compiled and you compile both these classes together then you may end up generating MyFile.txt twice and so doing duplicate work. By changing this so CreateProjection just adds 'MyFile.txt' to the queue of things to be done and then processing this list in this method, making sure to only do each piece of work once, you can process the fully up to date state of User.A and User.B to create the correct MyFile.txt just once.

Note that this method will be called just once per projection subclass, so CreateProjection may be called multiple times for each class with this projection type, but this method will only be called once at the end of the compile.

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