context in HPSGs, HPSG sub-grammars (modules ?)

[Gerald B Penn]

>Dear Vlado,
>
>  Shuly Wintner has done some work on modularity in grammars more
>generally.  I see two papers
>on his web-page about this:
>
>Modularized context-free grammars.
>In MOL6 - Sixth Meeting on Mathematics of Language, Pages 61-72,
>Orlando, Florida, July 1999.
>
>Compositional semantics for linguistic formalisms.
>Proceedings of ACL'99, the 37th Annual Meeting of the Association for
>Computational Linguistics, Pages
>96-103, June 1999.
>
>http://www.cis.upenn.edu/~shuly/publications
>
>Perhaps there are others.
>
>With respect to the logic of typed feature structures, I discuss an
>algebraic method for extracting
>sub-signatures from larger signatures/knowledge domains in my
>dissertation.  That is now available on-line
>at:
>
>http://www.cs.cmu.edu/~gpenn/cards/thesis.html
>
>Regards,
>Gerald
>
>