mfp/extprot — comment on commit 94967e8a7bf9bd4a69c7deee8a7ee0429990297c
File:  line 0
By ygrek:

also http://eigenclass.org/hiki/addressing-orm-problem-typed-relational-algebra and http://eigenclass.org/hiki/typed-relational-algebra-in-OCaml :)