Re: shapes as classes

I think of some shapes as  “Ensemble Types”. An ensemble was a concept introduced some decades ago for object-oriented analysis and design. See this paper by Fichman and Kemerler for more  -  http://csis.pace.edu/~marchese/CS775/Papers/Fichman_oo_conv_analy.pdf

"De Champeaux’s ensembles and ensemble classes are the most rigorously defined of the clustering mechanisms. Ensembles are analogous to conventional objects, while ensemble classes are analogous to conventional classes. An ensemble is a flat grouping of objects (or other ensembles) that naturally go together - usually because they participate in whole-to-part relationships. An automobile. for example, is an ensemble consisting of an engine, doors, wheels, etc. “

The reference to De Champeaux is: D. De Champeaux and P. Faure, “A Comparative Study of Object-Oriented Analysis Methods.” J. Oriented-Oriented Programming. Vol. 5. No. 1. 1992. pp. 21-33. 
Ralph Hodgson, @ralphtq

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On Dec 12, 2014, at 12:40 PM, Peter F. Patel-Schneider <pfpschneider@gmail.com> wrote:

> If "Shape" is more general than "Class", shouldn't all classes be shapes?
> 
> peter
> 
> 
> On 12/11/2014 12:40 PM, Holger Knublauch wrote:
>> I think my write-up makes it pretty clear that shapes are not classes, but
>> some classes are shapes. "Shape" is more general than "Class".
>> 
>> According to your definition in the glossary, a recognition condition defines
>> a new named term. Shapes can be used anonymously, e.g. as a nested structure
>> within another shape, and do not necessarily have to produce named terms.
>> 
>> I have likely misunderstood your point, but I am at this stage not sure what
>> issue you have specifically. Also please feel free to edit the wiki page - I
>> was definitely only creating a starting point and did not intend to speak on
>> behalf of the whole group.
>> 
>> Thanks
>> Holger
>> 
>> 
>> 
>> On 12/12/14, 4:53 AM, Peter F. Patel-Schneider wrote:
>>> I am uncomfortable with the group saying that shapes are RDF classes, as in
>>> 
>>> https://www.w3.org/2014/data-shapes/wiki/Resource_Shape_Association
>>> 
>>> particular in conjunction with anything that implying that shapes provide
>>> recognition conditions.  I think that this would put forward the notion that
>>> the working group is advocating that RDF should be extended to have
>>> recognition conditions on its classes.
>>> 
>>> 
>>> I say this even though OWL classes to provide recognition conditions, and
>>> can be considered to be shapes.
>>> 
>>> peter
>>> 
>> 
>> 
>