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I don't like OPTIONAL-REQUIRE; that's too much of a semantic clash.

How about=20

BEFORE-IF-PRESENT:

AFTER-IF-PRESENT:

This avoids using REQUIRE (since these aren't actual requirements,
just ordering constraints), and expresses the "if foo is here, this
has to go before foo, but if not don't worry" quite naturally (to me
anyway).

=2D-=20
    Greg Troxel <gdt@ir.bbn.com>

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