SV: [plcs-dex] Classification of type and individual

[Gyllström Leif <leif.gyllstrom@aerotechtelub.se>]

Rob

 

I would suggest that we only classify the typical due to the implications that the other approach will have on the reference data library.

 

We have agreed that refdata should be regarded as specializations (subclasses) of PLCS Entities. This would mean that an instance of

reference data would have to be defined for both the typical and the actual thing. Yes, OWL will allow for a class being a subclass of

several Entity classes. But I'm convinced that this will cause confusion and classes for typical will only appear as specializations of

the entity representing the actual etc.

 

I'm stongly in favor of keeping the separation of typical and actual,and exchange both instances, and have a consistent approach

throughout PLCS.

 

Regards

 

Leif

-----Ursprungligt meddelande-----
Från: Rob Bodington [mailto:rob.bodington@eurostep.com]
Skickat: den 18 februari 2005 17:27
Till: plcs-dex@lists.oasis-open.org
Ämne: [plcs-dex] Classification of type and individual

Hi

In PLCS we make a distinction between a typical something and an actual something.

 

E.g

Part and product_as_realized

State_definition and State_observed

 

We are also able to classify things.

E.g.

A Part is classified as a Bicycle

A  State_definition is classified as a Fault state.

 

The question is, if I classify the typical things, do I need to classify the actual thing?

 

For example, if I classify a Part as being a bicycle, do I need to classify the Product as realised as representing my bike, as a being a bicycle, or do I just classify the Part?

 

Similarly for states.

 

If we impose a rule that you only classify the typical – not the actual, then you will always have to exchange both the typical and the actual.

Which may be overkill.

 

Any thoughts?

Regards
Rob

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Rob Bodington
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