Hi Martynas,
On 25/10/17 10:33, Martynas Jusevičius wrote:
Thanks Dave.
We are materializing inferences during ontology initialization to avoid
using reasoner subsequently (as it impacts performance).
Makes sense.
So in that case I need to traverse the chain myself, correct?
Not if you've materialized the inferences. If you have constructed the
superClass closure as part of this materialization then the closure
should be visible through the OntAPI.
If you haven't included that in your materialization then indeed you
would need to traverse the chain yourself - either in the API or via
SPARQL property paths.
Dave
On Wed, Oct 25, 2017 at 9:33 AM, Dave Reynolds <dave.e.reyno...@gmail.com>
wrote:
On 24/10/17 23:51, Martynas Jusevičius wrote:
Hi,
I thought I understood how OntClass.listSuperClasses() works, but maybe I
don't.
I have such a class structure in my ontology (superclass is at the top):
3. https://www.w3.org/ns/ldt/document-hierarchy/domain#Item
2. http://atomgraph.com/ns/platform/domain#Item
1. https://localhost/admin/ns#AgentItem
Yet when I'm debugging, I can see the pair-wise relationships, but not the
chain all the way up from 1 to 3:
1. getOntology().getOntModel().getOntClass("
https://localhost/admin/ns#AgentItem
").listSuperClasses(false).toList().toString()
[https://localhost/admin/ns#ItemOfAgentContainer,
http://atomgraph.com/ns/platform/domain#Item]
2. getOntology().getOntModel().getOntClass("
http://atomgraph.com/ns/platform/domain#Item
").listSuperClasses(false).toList().toString()
[https://www.w3.org/ns/ldt/document-hierarchy/domain#Item]
I can see that within the method hasPropertyValue(
getProfile().SUB_CLASS_OF(), "SUB_CLASS_OF", cls ) returns false.
Why is that so? Is my usage wrong?
Additional info:
getOntology().getOntModel().getSpecification().getProfile() == OWLProfile
getOntology().getOntModel().getSpecification().getReasoner() == null
If I recall correctly the OntModel API is designed to retrieve whatever is
stated within the underlying model. The notion was that there was no point
in having the OntModel API replicate what reasoning does.
So to see the subclass closure you need to have a sufficient reasoner
configured.
Dave
