Hello:

A fellow ant user came to me with the following requirement:
perform packaging tasks if and only if the entire
set of some small number of known doc files was
present.

If "available" could specify a filelist, then you
could explicitly list a set of files, all of which
_must_ be present in order to set a property.

There may be other ways of fulfilling this particular
use case, but doesn't it make sense to extend
"available" in this way anyhow?  BTW, this would include
the regular "available" and the "available" inside
conditions.

Thoughts?

--Craeg

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