Helmut Merz wrote:

>Am Samstag, 12. November 2005 18:00 schrieb Jean-Marc Orliaguet:
>
>  
>
>>My 
>>impression is that you are thinking of a reference engine
>>rather than a relation engine 
>>    
>>
>
>Maybe I just don't see the difference... (There is one, of 
>course, but I doubt it is really of relevance in a practical 
>context. )
>
>Helmut
>  
>

A relation contains several references:
       
a relation between A, B and C involves 7 references:

A with itself
B with itself
C with itself
A with B
B with C
C with A
A with B with C

But a set of references don't make explicit relations, unless the
application know how to interpret the references.

/JM
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