Sebastian,
>
>----- Original Message -----
>From: Kingsley Idehen
>To: Sebastian Hellmann
>Cc: Virtuoso Users List
>Sent: Wednesday, November 18, 2009 3:26 PM
>Subject: Re: [Virtuoso-users] owl sameAs reasoning
>
>
>Sebastian Hellmann wrote:
>> Hello,
>> if I use a
>> SELECT DISTINCT ?s
>> {?s ?p ?o.
>> ?o bif:contains "Aspirin".
>> }
>>
>> and activate owl:sameAs reasoning, will it have any effect?
>>
>Naturally.
>
>When you enable owl:sameAs context rule you are asking Virtuoso to
>produce an union expansion across all entities in the owl:sameAs relation.
>
>To see this whole thing in effect simply take a look at the "Micheal
>Jackson" example [1] that I've banded around for a few months now. Note,
>what happens when you click on the Identifiers in the "Direct" and
>"Indirect" Co-reference tabs while the "owl:sameAs" context rule is
>disabled, then repeat the actions when its enabled (via Settings tab)
> ditto when the "b3sifp" context rule is enabled (which makes an even
>larger union expansion based on fuzzy rule that designated "foaf:name"
>as an Inverse Functional Property".
>> We want to query for all subjects associated to a certain label, i.e.
>> bif:contains '"Aspirin"' on the LODD data.
>> The problem is, that they contain 7 datasets about drugs and therefore a
>> lot of duplicates, partly linked with owl:sameAs across the 7 graphs.
>> So if we make a distinct query for 'Aspirin', will we get a unified set
>> of subjects or all?
>>
>You will have a set of subject identifiers that all lead you to the same
>solution comprised of:
>
>1. DISTINCT filter
>2. All properties and values across entities in the relation.
>
>You can basically substitute "Michael Jackson" for Aspirin and repeat my
>example at: http://lod.openlinksw.com/fct .
>
>Links:
>
>1.
>http://lod.openlinksw.com/fct/rdfdesc/usage.vsp?g=http%3A%2F%2Fdbpedia.org%2Fresource%2FMichael%5FJackson&tp=3
>2.
>http://www.semanticoverflow.com/questions/217/how-is-inference-used-in-practice
Additionally you can take a look at
http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtFacetBrowserInstallConfig#UsageStatistics
Best Regards,
Rumi
>
>Kingsley
>> Regards,
>> Sebastian
>>
>>
>
>
>--
>
>
>Regards,
>
>Kingsley Idehen Weblog: http://www.openlinksw.com/blog/~kidehen
>President & CEO
>OpenLink Software Web: http://www.openlinksw.com
>
>
>
>
>
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