New inferred statement notifications

[Alex Batlin]

In Stardog, can you figure out when a new statement is made, which inferences that generates in turn, and broadcast those as an event e.g. if I create either axioms or rules that infer say a money transactions based on one or more other statements, is there a way to figure out that a new statement will now be inferred, and have an action hook to deal with that?

[Héctor Pérez-Urbina]

Dear Alex,

Stardog does not materialize inferences; rather, we employ a query-rewriting approach as explained here [1].

[1] http://docs.stardog.com/owl2/#sd-Query-Rewriting

On Mon, Feb 17, 2014 at 9:25 AM, Alex Batlin <alex....@bytehaus.co.uk> wrote:

In Stardog, can you figure out when a new statement is made, which inferences that generates in turn, and broadcast those as an event e.g. if I create either axioms or rules that infer say a money transactions based on one or more other statements, is there a way to figure out that a new statement will now be inferred, and have an action hook to deal with that?

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Best,
Héctor

[Alex Batlin]

I know that, sorry if the question is confused but what I am asking is : is there a way to create a hook in Stardog so that when a new statement is inserted, the hook is fired with all new inferred statements? 

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[Héctor Pérez-Urbina]

On Tue, Feb 18, 2014 at 1:05 PM, Alex Batlin <alex....@bytehaus.co.uk> wrote:

I know that, sorry if the question is confused but what I am asking is : is there a way to create a hook in Stardog so that when a new statement is inserted, the hook is fired with all new inferred statements? 

Not directly. Inferred statements exist only implicitly: they become apparent *only* when a relevant query is executed. As such, we can't know when they are generated (because they're not).

You could come up with a query that talks about the type of statement you're interested in, execute it every time a new statement is inserted, and in case it has any 'new' results, do something. This would be similar to having a trigger over materialized views.

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Best,
Héctor

[Alex Batlin]

Good idea thanks will try that

Sent from my iPhone