Re: lookup-def

Hello!

	The macro lookup-def that has been discussed here a few times
is now in use in SSAX/SXML. The macro is implemented as R5RS
syntax-rules (on Scheme48, PLT Scheme, SCM, Petite Chez Scheme) and as
a low-level macro on Bigloo and Gambit. The syntax and the semantics
are the same in all the cases. The implementation is in the file
SSAX/lib/lookup-def.scm and in various myenv-*.scm files.  The file
SSAX/tests/vmyenv.scm contains the regression tests. Michael Sperber
has kindly described the macro in SSAX/lib/packages.scm and tested the
macro on PLT Scheme and Scheme48. All uses of an earlier version of
lookup-def (specifically, in SXML-to-HTML-ext.scm) have been
corrected. Terrence Brannon was correct: lookup-def seems to be of
general utility indeed.




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