[sc34wg3] Topic Maps land and SAM land

Jan Algermissen sc34wg3@isotopicmaps.org
Wed, 12 Feb 2003 19:12:44 +0100

Lars Marius Garshol wrote:
> * Lars Marius Garshol
> |
> | Uh? If the URIs are the same, RDF considers that the statements are
> | referring to the same resource (subject). There's also machinery in
> | both DAML+OIL and OWL for working out when different URIs represent
> | the same thing, and even for working out when they must represent
> | different things. So the situation compared to topic maps is that
> | you have a stronger apparatus for declaring when things are the
> | same, and in addition an apparatus for declaring when they can't be.
> * Jan Algermissen
> |
> | Hmm...one of the basic ideas of the RM is that it enables TM Models
> | (RM: Applications) to define whatever rules they need for declaring
> | subject equivalence. Why do you think that this is that not stronger
> | than what RDF provides?
> I confused topic maps and the RM in the above, sorry. SAM has weaker
> support than does DAML+OIL/OWL because it has neither capability. RM
> does better, because it allows multiple ways to specify merging, but
> it does not have a capability to declare that things are different.
> So DAML+OIL/OWL is currently stronger than either.

Ah, I understand. I am not sure, but I think the RM could be extended to
also use properties for explicitly saying that two nodes definitely don't
have the same subject.


> * Lars Marius Garshol
> |
> | and a not-quite-so-minor issue with respect to reification, but
> | that's really it. In all, the similarities are much greater than the
> | differences, which is not the case if you compare RDF/SAM. RDF is
> | lower-level than SAM, but pretty much at the same level as RM.
> * Jan Algermissen
> |
> | The RM provides a framework for defining TM Models (such as the SAM
> | for example) and this is something very different to what RDF is.
> Well, "a framework for defining TM Models" is intention. I'm comparing
> the two data models (RM/RDF), not how their makers intended them to be
> used. The intentions are of course very, if not entirely, different.
> --
> Lars Marius Garshol, Ontopian         <URL: http://www.ontopia.net >
> GSM: +47 98 21 55 50                  <URL: http://www.garshol.priv.no >
> _______________________________________________
> sc34wg3 mailing list
> sc34wg3@isotopicmaps.org
> http://www.isotopicmaps.org/mailman/listinfo/sc34wg3

Jan Algermissen                           http://www.topicmapping.com
Consultant & Programmer	                  http://www.gooseworks.org