Re: transitive closure concept



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From: Gerrit Renker (gerrit_renker@yahoo.co.uk)
Date: Thu 22 Jan 2004 - 16:11:37 GMT


Hi Stefan,

agreed. But you should add that the OCL-code required to compute the
transitive closure consumes one and a half A4 pages. Mandel/Cengarle's
paper was an academic investigation about the capabilities of OCL, not
a
howto for cerating new operators. A shorter version (also based on
Floyd/Warshall) was introduced by Richters and required nested sets.

G.
 --- Stefan Haustein <haustein@kimo.cs.uni-dortmund.de> wrote: > Gerrit
Renker wrote:
> 
> > this has been an open issue since the 1998 Amsterdam manifesto on
> OCL,
> > so the fact that you can not do it in OCL has already celebrated
> its
> > 5th birthday :( Can recommend Z, closures being a built-in.
> 
> Hi Gerrit,
> 
> "You cannot do tranistive closure in OCL" seems inconsistent with 
> Mandel/Cengarle/1999:
> 
>
http://projekte.fast.de/Projekte/forsoft/ocl/4_2More_than_Complete.html
> 
> (?)
> 
> Best regards
> Stefan Haustein
> 
> 
> 
> 
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