Hi Steve,
figuring out that all instances of Action are also instances of Event is
typically called an inference. In semantic web technology, inferencing
is supported by many languages including RDF Schema, where the
rdfs:subClassOf property is defined in. However, SPARQL by default does
not apply inferencing, and only delivers the information that is
explicitly stated in the query graph.
So you can either run inferencing first (in TBC through the run
inferences button) or - often the better choice - make your query
independent of such assumptions and build the intelligence into the
query. In your case the query could use the * operator that walks down
into all suclasses of the Event class to find all instances:
SELECT ?event
WHERE {
?type rdfs:subClassOf* ex:Event .
?instance a ?type .
}
Note that rdfs:subClassOf* includes the Event class itself, while
rdfs:subClassOf+ would not.
HTH
Holger
On 1/8/2013 16:26, tsaltd wrote:
One of the ontologies that I imported into TBC has a Class/Subclass
relationship ... in this case it is:
Event
* Action
* Gain
* Introduction
* Loss
(etc .. )
And when I do a Sparql Query to return all events that are of type
Event ... the instances that are classified as Action, Loss, etc are
not returned
( The SubcassOf ) attribute is on for each of the subtype "templates"
and Action, Gain, Intro ... etc also appear in the tree as children
of Event.
So I decided to add the rdfs:IsSubClasOf property to the form for each
of the subtypes .... when I do that ... the instances for the subtype
appear in the classes window (under Action, I believe ... ant they
also display in the instances grid ... and the sparql query returns
them the way I need them to be returned ( as instances of the parent
Event )
I assume this is well understood behavior .... adding the
rdfs:isSubclass seems to fix the problem ... but what's the story with
the instances appearing in the Classes tree ...
And now I'm wondering if my sparql query should be ... ?
rdfs:IsSubclassOf xyz:;Event instead of ? a Event ( nope .. that
didn't work it returns the classes not the instances )
A newbie question ?? I am one ...
Steve
.
.
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