Hi Arthur,
by default, magic properties are not available as "inferred" triples while
browsing a model in TopBraid. They are computed on demand in SPARQL queries
only. However, you can add a SPIN rule such as
CONSTRUCT {
?a my:magicProperty ?b .
}
WHERE {
?a my:magicProperty ?b .
}
to make them explicit. This way you avoid duplicating the definitions of the
body. I am sure this could be generalized into a single rule for all magic
properties, at least with a bit of Java coding (e.g. write a meta magic
property that runs all other magic properties). If that's of interest I can add
something to 3.3
Another option is to implement a Jena Graph that does this automatically on
findSPO calls. This would be an interesting exercise, although it won't help
you short term.
Regards
Holger
On Dec 18, 2009, at 4:37 PM, Arthur Keen wrote:
> I am looking into SPIN to compute derived quantities in an analytical model.
> I studied the blog on magic properties, and tried it out the grandParent
> magic property on kennedys.owl and it works as promised. I understand that
> these magic properties are intended to extend SPARQL, however, since they are
> properties, could they be extended to be used for late binding properties on
> objects, so that the values could be computed on access? I tried
> unsuccessfully to do this, and concluded that were not meant to be used in
> this way and that I should use spin rules for computing derived properties on
> objects. Is that correct?
>
> Arthur
>
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