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[Nicola Larosa]

> One of the papers I think is very useful to seeing this is Christopher
> Alexander's A City is Not a Tree, available at
> http://www.rudi.net/bookshelf/classics/city/alexander/alexander1.shtml
> .  It outlines the difficulties and shortcomings of using hierarchies.

Sir,
having read said paper, I feel the need to express my gratitude to you
for having mentioned it. The paper admirably describes the limitations
of the hierarchical tree structure (a.k.a. DAG, direct acyclic graph),
limitations I have felt for a long time, but could not accurately pinpoint.

It looks like some study of the properties of the semilattice structure
is in order. Thanks again.

-- 
Nicola Larosa - nico at tekNico.net

...this book does not recommend exercises such as Hanon and Czerny, that
are not meant to be memorized and performed; by the same token, the
Chopin Etudes are recommended. Practicing something that wasn't meant to
be performed is not only a waste of time, but also degrades any sense of
music you originally had. -- Chuan C. Chang, Fundamentals of Piano
Practice, 2nd Edition - http://members.aol.com/chang8828/contents.htm