Re: About XML to multiple language/multiple outputs

[Matthias Clasen <clasen@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

> 
> > > Frank said:
> > > ------------------------------------------------------
> > > If the query-rule construct can be simplified so as to make it
> > universal,
> > > i.e., so that all the other rules can be expressed in terms of
> > it, then I'm
> > > all in favor of it.
> > >
> > > Didier answer:
> > > ------------------------------------------------------
> > > Good.
> > >
> >
> > No need to do anything here, query is already universal.
> 
> Maybe semantically, but not in practice. I meant something along the lines
> of how natural numbers can be encoded as lambda-functions (Church numerals),
> or derived expressions in Scheme can be defined by macro definitions. In
> other words, the equivalence should expressible in the language itself.
> 

This would be possible with the R5RS macro system, or am I overlooking
something ? Maybe getting the priorities right would be a little tricky. 
 
-- 
Matthias Clasen, 
Tel. 0761/203-5606
Email: clasen@xxxxxxxxxxxxxxxxxxxxxxxxxx
Mathematisches Institut, Albert-Ludwigs-Universitaet Freiburg


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