Re: [Bigdata-developers] SWRL support

[Michael S. <ms...@me...>]

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...> 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/>
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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/>
>