Re: Fwd: Re: TMRM: isa/sub - irreflexive relation vs. reflexive relation

Hiya,

I'm starting to think I'm missing something. For example,
"tmcl:topic-type isa tmcl:topic-type", I'm assuming what is meant here
is ;

   The instance tmcl:topic-type is of the class tmcl:topic-type

Isn't this poorly defined identifiers (naming instances the same as
classes) rather than something we should allowing people to do? I can
understand that some might think this a good idea (like always create
a static default instance for every class, ala prototypes), but it
sounds terrible to me. Could someone explain why even doing this is a
good idea? It sounds like software engineering rather than human
understanding and modelling ... :)


Regards,

Alex







On Thu, Oct 6, 2011 at 8:23 AM, Lars Heuer <[email protected]> wrote:
>
>
> On behalf of Quitnin.
>
> (sent from my local mail client)
>
>
> This is a forwarded message
>
> From: Quintin Siebers <[email protected]>
> To: Lars Heuer <[email protected]>
> Date: Wednesday, October 5, 2011 9:56:36 PM
> Subject: [topicmapmail] TMRM: isa/sub - irreflexive relation vs. reflexive relation
>
> ===8<==============Original message text===============
>
>
>
> Sent from my iPhone
>
> On Oct 5, 2011, at 11:05, Lars Heuer <[email protected]> wrote:
>
>> but I wonder why
>> stating "x isa x" is explicitly forbidden.
>
> Another place were we use this is when we define a meta ontology that describes topicmaps:
>
> k:topic-type isa k:topic-type
>
> Making x isa x forbidden would cause me great headaches because it would break my schema ontology to validate itself. This leads me to another question:
>
> Does TMCL not specify:
> "tmcl:topic-type isa tmcl:topic-type"
> ?
>
> http://www.isotopicmaps.org/tmcl/schema.ctm
>
> ===8<===========End of original message text===========
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