Matthias,
If you would like to see a concrete example, fully worked out, see the ICFP
paper on constructing a domain-specific language for scripting the production
of videos (say RacketCon presentations):
https://www2.ccs.neu.edu/racket/pubs/#icfp17-dnff
At the surface, this could be done as a piece of two modules: the surface
language (boring) and the run-time library that connects to existing NLVE
systems. But as it turns out, if you truly take the slogan seriously, you can
easily see how we build this application as a composition of EIGHT (8) DSLs,
three used at the surface (Video, Typed Video, and Docu Video) and five below,
inside the application.
This is really a nice illustration of "The Racket Way". Please consider
pointing to this on the Racket Web site. Or, better yet, put a less
academic writeup on this example to the Web site.
I found the implementation of the Video language on pkg.racket-lang.org,
but neither Typed Video nor Docu Video seem to be there. Are they
available elsewhere? I am particularly interested in Docu Video because
I wonder if it can be implemented as a composition of "Video" and
"Scribble" or if it needs to be defined from scratch, re-using only the
implementation modules of "Video" and "Scribble".
Konrad.
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