There is a library for java called checker-framework which provides for
pluggable types using annotation processing. Most importantly it is a
framework that can be used by the user to create their own specialized
types.

I have been thinking of using this library to implement a unique constraint
on ordinals for example.

In any case it seems to me that it would be a food thing to implement
extendable "static" types in a system with an image. For one there should
already be a usable representation of the code in the image and maybe more
importantly "semi-static" structures that otherwise wouldn't be setup until
runtime can be available for the analysis which should come in handy when
altering a running system.

BR,
John
Den 4 jun 2011 06:59 skrev "C. Scott Ananian" <csc...@laptop.org>:
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