Thanks, looks interesting. I've also found related work:
https://www.uni-koblenz-landau.de/koblenz/fb4/institute/IFI/AGStaab/Research/systeme/NetworkedGraphs/
But there does not seem to be a library one can use with, say, Sesame.
On Jul 24, 2009, at 15:43 , Martin Hepp (UniBW) wrote:
Did you look at SPIN?
http://spinrdf.org/
That should allow you do do a lot with data without leaving the now
mainstream Semantic Web technology stack (as long as a small
fragment of OWL is sufficient for you).
Best
Martin
Axel Rauschmayer wrote:
I'm currently reading Hendler's brilliant book "Semantic Web for
the Working Ontologist". It really drove home the point that OWL is
not a good fit when using RDF for *data* (names are generally not
unique, open world assumption, ...).
But what is the alternative? For my applications, I have the
following requirements:
- Properties: transitivity, inverse, sub-properties.
- Resources, classes: equivalence. For my purposes, equivalence is
a way of implementing the topic merging in topic maps [1].
- Constraints for integrity checking.
- Schema declaration: partially overlaps with constraints, serves
for documentation and for providing default values for properties.
- Computed property values: for example, one property value being
the concatenation of two other property values etc.
The difficulty seems to me to find something universal that
fulfills these requirements and is still easy to understand.
Inference, when used for transitivity and equivalence, is simple,
but when it comes to editing RDF, they can confound the user: Why
can some triples be replaced, others not? Why do I have to replace
the triples of a different instance if I want to replace the
triples in my instance?
While it's not necessarily easier to understand for end users, I've
always found Prolog easy to understand, where OWL is more of a
challenge.
So what solutions are out there? I would prefer description logic
programming to OWL. Does Prolog-like backward-chaining make sense
for RDF? If so, how would it be combined with SPARQL; or would it
replace it? Or maybe something frame-based?
Am I making sense? I would appreciate any pointers, hints and
insights.
Axel
[1] http://www.topicmaps.org/xtm/index.html#desc-merging
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