| This class is a placeholder for Avalon Context keys.
In order to decouple James from Phoenix, and to allow James
to run in any Avalon Framework container it is necessary that
James not depend on the BlockContext class from Phoenix, but
rather only on the Context interface. This requires that we
look up context values directly, using String keys. This
class stores the String keys that are used by James to
look up context values.
The lifetime of this class is expected to be limited. At some
point in the near future the Avalon folks will make a decision
about how exactly to define, describe, and publish context
values. At that point we can replace this temporary mechanism
with the Avalon mechanism. Unfortunately right now that decision
is still unmade, so we need to use this class as a temporary
solution.
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