Enum used in (@link Extension) to indicate the compatibility
of one extension to another. See (@link Extension) for instances
of object.
WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
This file is from excalibur.extension package. Dont edit this file
directly as there is no unit tests to make sure it is operational
in ant. Edit file in excalibur and run tests there before changing
ants file.
WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING