[topicmapmail] Questions About XTM Occurrence Semantics

[Lars Heuer]

Hi Peter,

> Assume there is an information resource on the web - an image in a
> document. As a topic map builds up three topics come into being {A, 
> B,C}, each with different subject identifiers, but all of which refer to
> that image from an occurrence. In each case the occurrence referring to
> the image is in a different scope, but each occurrence has the same IRI
> value.
> Topic A : Scope D : Occurrence #1 : Value IRI V
> Topic B : Scope E : Occurrence #2 : Value IRI V
> Topic C : Scope F : Occurrence #3 : Value IRI V

I have to admit that I do not understand the whole problem
you've described, but IMO you make the model more complicated than
necessary.

Why do you not represent the occurrence IRI as topic? In Topic Maps we
have subject locators which seem to be a natural candidate for your
use case.
The image in the document exists in any case. The scope does not change
the existence of the image, so you can convert the occurrence into a
topic.

And you connect the topics A, B, C to the topic "image" via
(scoped) associations.

And if you reify the particular associations you can make statements
about them.

Best regards,
Lars
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