Yes, typically, {?var ?p ?o} is the same and much more efficient than {?s ?p
?o. FILTER (?s = ?var)}.
In the context of the SERVICE keyword and, more generally, if ?var is unbound,
results can be different. Queries are evaluated inside out and in the first
case you may get everything since ?var is unbound, in the second case, nothing
since ?var is unbound.
In any case, I am not sure why you need a SERVICE keyword. It is typically used
to federate queries across different endpoints.
> On Apr 20, 2017, at 10:25 AM, sanjeev devireddy <[email protected]>
> wrote:
>
> Hi Irene,
> There is no specific reason to use ?s ?p ?o followed by a filter.
> Actually I was trying different things since with SERVICE keyword that
> service doesn't work. It was just one change among the different things that
> I tried :)
>
>
> Thanks,
> sanjeev
>
>
> On Thursday, April 20, 2017 at 6:54:37 PM UTC+5:30, Irene Polikoff wrote:
> It is extremely not efficient to use the pattern:
>
> ?s ?p ?o followed by a filter, when ?s,?p and?o are all unbound.
>
> You are retrieving every single triple in the graph and then filtering out.
> It is also typically unnecessary.
>
> Is there any reason you can't replace it with simply:
>
> ?conceptURI ?p ?o.
>
> Sent from my iPhone
>
> On Apr 14, 2017, at 9:09 AM, sanjeev devireddy <deviredd...@ <>gmail.com
> <http://gmail.com/>> wrote:
>
>> Hello,
>> By following the examples given at http://uispin.org/swon.html
>> <http://uispin.org/swon.html>, a service is developed to get the
>> properties(Predicates & Objects) of a Concept as shown below. This code
>> snippet works fine without the SERVICE Keyword. But when the SERVICE keyword
>> is used then the concept URI value has to be hard coded otherwise zero
>> results are returned.
>>
>> <swon:Array>
>> <ui:forEach ui:resultSet="{#
>> SELECT ?p ?o
>> WHERE {
>> SERVICE ?sparqlEndPoint {
>> GRAPH ?graphURI {
>> ?s ?p ?o .
>> FILTER (?s = ?conceptURI) .
>> } .
>> } .
>> } }" ui:separator=",">
>> <swon:Object>
>> <swon:Value arg:name="result" arg:value="{= ui:label(?p) }"/>
>> <swon:Value arg:name="label" arg:value="{= ui:label(?o) }"/>
>> </swon:Object>
>> </ui:forEach>
>> </swon:Array>
>>
>>
>> URL to invoke the REST service
>> http://localhost:8083/tbl/swp?_viewClass=g:getProperties&graphURI=urn:x-evn-master:geo&conceptURI=http://topquadrant.com/ns/examples/geography%23Asia&sparqlEndPoint=<sparqlEndPoint_URI>
>>
>> <http://localhost:8083/tbl/swp?_viewClass=g:getProperties&graphURI=urn:x-evn-master:geo&conceptURI=http://topquadrant.com/ns/examples/geography%23Asia&sparqlEndPoint=%3CsparqlEndPoint_URI%3E>
>>
>> I hope it is something to do with the way the URI is placed/passed
>> dynamically at the line FILTER (?s = ?conceptURI), when the SERVICE keyword
>> is used. Could some one please help us here?
>>
>>
>> Thanks,
>> sanjeev
>>
>>
>>
>>
>>
>>
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