Hi Meng --
Like the updated spec -- much simpler using the macro system.
But "include" v "exec" -- what's the difference? Apart from the basic
semantic difference a la subroutines vs jumps in procedural programming,
I can't see why an "exec" couldn't just be replaced by a specifier using
"include" and then simply omitting extra directives.
IMO, keeping the number of mandatory mechanisms down is key
to SPF usage, so this is an important point.
--j.
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