[m-rev.] for review: improvements to relation.m

[Julien Fischer]

On Wed, 5 Sep 2007, Peter Ross wrote:

> On 9/5/07, Ralph Becket <rafe at csse.unimelb.edu.au> wrote:
>> Julien Fischer, Wednesday,  5 September 2007:
>>>> I also considered changing "key" to "vertex", "element" to "value", and
>>>> changing the module name to directed_graph or dgraph (I prefer the latter).
>>>
>>> I prefer the name digraph.
>>
>> digraph or directed_graph.
>>
> digraph.
>
> please also mark all the relation predicates obsolete. (do we have an
> obselete module declaration?)

No, our pragma obsolete currently only applies to predicates or
functions.  It would be useful to have pragma obsolete_module or
something similar that would mark everything in the module interface
as obsolete.  It would also useful to allow things like types,
typeclasses and other things that can appear in a module interface
to be marked as obsolete.

Julien.
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