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- From: Rick JELLIFFE <ricko@geotempo.com>
- Date: Mon, 23 Oct 2000 13:41:29 +0800
"Roger L. Costello" wrote:
> Any other thoughts on coupling/cohesion and how it applies to schema
> design?
I have a few of pages* on this in my book. It is just a summary of
Constantine & Yourdan's
levels of cohesion:
coincidental
logical association
temporal association
procedural cohesion
communication cohesion
sequential cohesion
functional cohesion
Going from weakest to strongest.
It is interesting that logical association is suggested as
a very weak coherence (and therefore a weak reason for things to
coupled) but it is often
the design principle behind some schemas, apparantly (RDF's syntaxes?)
Rick Jellife
* see "Cohesion & Coupling" p 1-52, ch3 "Software Engineering" in "The
XML & SGML Cookbook",
Prentice Hall, 1998.
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