References
----------

* http://code.google.com/p/magritte-metamodel/
* http://www.cliki.net/lisp-on-lines
* http://common-lisp.net/project/lisp-on-lines/repo/lisp-on-lines/doc/manual.html
* http://scg.unibe.ch/archive/papers/Reng07aMagritte.pdf