Hi Lee,
OK, we'll try sparql dev, as long as this is a how to, rather than a "can't
be
done". But it looks to me like
your query returns no bindings if an article does not have a timetag. I
say this because of the {?a ex:timetag ?maxtime} clause
that comes before the OPTIONAL. But in that case, it should return
the article. Can you fix this, or is it not expressible after all?
>
> In SPARQL, this query is (unedited, untested):
>
> SELECT ?a
> FROM :model
> WHERE {
> ?a rdf:type ft:article ; ex:timetag ?maxtime .
> OPTIONAL { ?a ex:timetag ?othertime . FILTER(?othertime > ?maxtime) }
> FILTER (!bound(?othertime) && ?maxtime > '...now...')
> }
>
> Original target:
SELECT ?a
FROM model
WHERE
(?a rdf:type ft:Article) AND
UNSAID ((?a ex:timetag ?time) AND
(?time > $NOW))
=====================================
Robert MacGregor
Chief Scientist
Siderean Software, Inc.
[EMAIL PROTECTED]
Mobile: 310-469-2810
=====================================
