Re: [Bigdata-developers] SWRL support

[Jeremy J C. <jj...@sy...>]

At Syapse we take an approach very like that suggested by Michael where the inference that we need is addressed by a combination of somewhat fancier SPARQL queries and carefully selected materialization using SPARQL update.

While this does indeed require care in maintenance, we scale into the billions of triples in a way that is hard to imagine with a fully ‘intelligent’ approach to inference rules

Jeremy




> On May 25, 2015, at 11:20 PM, Michael Schmidt <ms...@me...> wrote:
> 
> Alex,
> 
> sure, I understand — it would ease maintainability, but also when implemented properly at DB level complex inferencing would not be free of (performance) costs. However, afaik there’s currently no SWRL support built-in. 
> 
> One option might be to use external reasoners (loading the data in memory), see for instance this recent discussion thread here: http://sourceforge.net/p/bigdata/mailman/message/34073626/ <http://sourceforge.net/p/bigdata/mailman/message/34073626/>. The feasibility of this approach might depend on your use case/requirements, of course. 
> 
> Maybe Bryan has other ideas on how to best approach your use case.
> 
> Best,
> Michael 
> 
> 
>> On 26 May 2015, at 07:51, Alex Jouravlev <al...@bu... <mailto:al...@bu...>> wrote:
>> 
>> Michael,
>> 
>> The same way you can render OWL redundant - it can also be replaced with Sparql updates. 
>> 
>> However there is a massive advantage in relying on reasoning happening behind the scene as opposite to generating and inserting inferred triples now and then. You bet more maintainable, intelligent solution. 
>> 
>> Regards,
>> 
>> Alex
>> 
>> On Tuesday, May 26, 2015, Michael Schmidt <ms...@me... <mailto:ms...@me...>> wrote:
>> Dear Alex,
>> 
>> is there anything that speaks against SPARQL UPDATE?
>> 
>> - http://www.w3.org/TR/sparql11-update/ <http://www.w3.org/TR/sparql11-update/>
>> - http://wiki.blazegraph.com/wiki/index.php/SPARQL_Update <http://wiki.blazegraph.com/wiki/index.php/SPARQL_Update>
>> 
>> If I understand your scenario right, your UPDATE query  (untested!) might look something like:
>> 
>> INSERT
>> {
>>   ?from :myNewObjectProperty ?to
>> }
>> WHERE
>> {
>>    ?node :from ?from .
>>    ?node :to ?to .
>>    ?node :dType "givenValue" .
>> }
>> 
>> This query would insert an edge "?from :myNewObjectProperty ?to” whenever there exists a node satisfying the condition (you may need to take care of multivalued properties).
>> 
>> Best,
>> Michael
>> 
>>> On 25 May 2015, at 23:19, Alex Jouravlev <al...@bu... <javascript:_e(%7B%7D,'cvml','al...@bu...');>> wrote:
>>> 
>>> Hi guys,
>>> 
>>> Do you know if Blazegraph supports SWRL? 
>>> 
>>> If not, would be the best way to approach the following:
>>> 
>>> I have a node that have object properties "from" and "to" and data properties "dType". I need to derive an object property pointing from "from" object to "to" object when the value of "dType" is equal to given.
>>> 
>>> Thank you
>>> Alex Jouravlev
>>>  <>Director, Business Abstraction Pty Ltd 
>>> Phone:       +61-(2)-8003-4830
>>> Mobile:     +61-4-0408-3258
>>> Web: http://www.businessabstraction.com <http://www.businessabstraction.com/>
>>> LinkedIn: http://au.linkedin.com/in/alexjouravlev/ <http://au.linkedin.com/in/alexjouravlev/>
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>> 
>> 
>> 
>> -- 
>> Alex Jouravlev
>>  <>Director, Business Abstraction Pty Ltd 
>> Phone:       +61-(2)-8003-4830
>> Mobile:     +61-4-0408-3258
>> Web: http://www.businessabstraction.com <http://www.businessabstraction.com/>
>> LinkedIn: http://au.linkedin.com/in/alexjouravlev/ <http://au.linkedin.com/in/alexjouravlev/>
>> 
> 
> ------------------------------------------------------------------------------
> One dashboard for servers and applications across Physical-Virtual-Cloud 
> Widest out-of-the-box monitoring support with 50+ applications
> Performance metrics, stats and reports that give you Actionable Insights
> Deep dive visibility with transaction tracing using APM Insight.
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