That can't be. I tried your example b.java with my query
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX cv:
<http://www.semanticweb.org/toshiba/ontologies/2017/3/untitled-ontology-6#>
INSERT {
?ass cv:recorded_speed ?avg .
}
WHERE
{ SELECT ?ass (AVG(?speed) AS ?avg)
WHERE
{ ?v cv:vehicleSpeed ?speed ;
cv:Vehicle_Road ?r .
?ass cv:avgSpeedSensor_Infrastructue ?r
}
GROUP BY ?ass
}
Before execution the model contains 67 triples, afterwards 69. And the
added triples are as follows:
For SpeedSensor2:
untitled-ontology-6:SpeedSensor2
a untitled-ontology-6:Speed_Sensor ,
untitled-ontology-6:Sensor , untitled-ontology-6:Avg_Speed_Sensor ,
owl:NamedIndividual ;
untitled-ontology-6:avgSpeedSensor_Infrastructue
untitled-ontology-6:Road2 ;
untitled-ontology-6:recorded_speed
50.0 ;
untitled-ontology-6:sensorLocatedInInfrastructure
true ;
untitled-ontology-6:sensorLocatedInVehicle
false .
for SpeedSensor1:
untitled-ontology-6:SpeedSensor1
a untitled-ontology-6:Speed_Sensor
, untitled-ontology-6:Sensor , untitled-ontology-6:Avg_Speed_Sensor ,
owl:NamedIndividual ;
untitled-ontology-6:avgSpeedSensor_Infrastructue
untitled-ontology-6:Road1 ;
untitled-ontology-6:recorded_speed
0.0 ;
untitled-ontology-6:sensorLocatedInInfrastructure
true ;
untitled-ontology-6:sensorLocatedInVehicle
false ;
untitled-ontology-6:sensor_id 11 .
You can, see both now have the recorded_speed value.
> And I explained that using Lorenz's example syntax is something that I have
> already tried before asking on the list and still the update to the owl
> file does not take place. I mentioned that in my previous email.
> I think the 2000+ lines u r mentioning are the full ontology file. I
> mentioned that the file called ont.owl is the full one in case needed, but
> I have already provided a short version called Yarab.owl .. Doubt that
> Yarab.owl is 2000+ lines, it has the basic two sensors, two vehicles, two
> roads instances and a couple of properties ..and it has lots of white lines
> to separate the code to blocks for readability purposes. Which file did u
> look at? I think u looked at the one I had described to be the full
> ontology.
>
> On Jun 9, 2017 6:50 PM, "Andy Seaborne" <a...@apache.org> wrote:
>
>> " cv:Vehicle_Road ?r ;"+
>> Bad syntax. Replace ";" by "."
>>
>> Lorenz showed you the correct syntax.
>>
>> "?ass cv:avgSpeedSensor_Infrastructue ?r ."+
>> Print the query out and see what it looks like. Hence the earlier
>> suggestion you put newlines in the query.
>>
>> Andy
>>
>> ~2800 lines is not a minimal example.
>>
>> On 09/06/17 15:53, Aya Hamdy wrote:
>>
>>> When I do not use the subselect and write the query this way:
>>>
>>> String queryString1 =
>>> "PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>"+
>>> "PREFIX cv:<
>>> http://www.semanticweb.org/toshiba/ontologies/2017/3/untitled-ontology-6#
>>>> "+
>>> "INSERT {"+
>>> " ?ass cv:recorded_speed ?avg"+
>>> "}"+
>>> "WHERE {"+
>>> "SELECT (AVG(?speed) AS ?avg) {"+
>>> "?v cv:vehicleSpeed ?speed;"+
>>> " cv:Vehicle_Road ?r ;"+
>>> "?ass cv:avgSpeedSensor_Infrastructue ?r ."+
>>>
>>>
>>>
>>> "}"+ "GROUP BY ?r ?ass"+
>>> "}";
>>>
>>> The code generates the error below when it tries to execute the update
>>> action:
>>> Exception in thread "main" org.apache.jena.query.QueryParseException:
>>> Encountered " <VAR1> "?r "" at line 1, column 299.
>>> Was expecting one of:
>>> "values" ...
>>> "graph" ...
>>> "optional" ...
>>> "minus" ...
>>> "bind" ...
>>> "service" ...
>>> "filter" ...
>>> "{" ...
>>> "}" ...
>>> ";" ...
>>> "," ...
>>> "." ...
>>>
>>> When I researched these options under "Was expecting one of:", I did not
>>> find one of those options that would fit my query.
>>> I need this line: "?ass cv:avgSpeedSensor_Infrastructue ?r ." to ensure
>>> that the sensor is attached to the road on which the car is on.
>>>
>>> I group by ?r to try to ensure that the grouping is per road as well. But
>>> I
>>> think you have a point, and I should group by the sensor as well.
>>>
>>> Note: when I write the " cv:Vehicle_Road ?r ;"+ line with a full stop
>>> instead of a full stop the error goes away, but still, nothing happens in
>>> the owl file. Meaning, the new tuple is not added either. (I am a bit
>>> confused as to when to put a ";" and when to put a "." I believe, as far
>>> as
>>> my understanding goes, when I put a "." in the end of the
>>> " cv:Vehicle_Road ?r " the error goes away because the last line "?ass
>>> cv:avgSpeedSensor_Infrastructue ?r ." is ignored in the first place.
>>> could
>>> you confirm or negate that?)
>>>
>>> Your help is truly much appreciated.
>>>
>>> On Fri, Jun 9, 2017 at 2:30 PM, Lorenz Buehmann <
>>> buehm...@informatik.uni-leipzig.de> wrote:
>>>
>>> There was some formatting issue in my previous mail.
>>>> What I was wondering the need for grouping by ?r instead of ?ass.
>>>>
>>>> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
>>>> PREFIX cv:
>>>> <http://www.semanticweb.org/toshiba/ontologies/2017/3/untitl
>>>> ed-ontology-6#
>>>>
>>>>>
>>>> INSERT {
>>>> ?ass cv:recorded_speed ?avg .
>>>> }
>>>> WHERE
>>>> { SELECT ?ass (AVG(?speed) AS ?avg)
>>>> WHERE
>>>> { ?v cv:vehicleSpeed ?speed ;
>>>> cv:Vehicle_Road ?r .
>>>> ?ass cv:avgSpeedSensor_Infrastructue ?r
>>>> }
>>>> GROUP BY ?r ?ass
>>>> }
>>>>
>>>>
>>>>
>>>> On 09.06.2017 16:29, Lorenz Buehmann wrote:
>>>>
>>>>> That is your query:
>>>>>
>>>>> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
>>>>> PREFIX cv:
>>>>> <http://www.semanticweb.org/toshiba/ontologies/2017/3/
>>>>>
>>>> untitled-ontology-6#>
>>>>
>>>>> INSERT {
>>>>> ?ass cv:recorded_speed ?avg .
>>>>> }
>>>>> WHERE
>>>>> { SELECT (AVG(?speed) AS ?avg)
>>>>> WHERE
>>>>> { ?v cv:vehicleSpeed ?speed ;
>>>>> cv:Vehicle_Road ?r
>>>>> { SELECT ?r
>>>>> WHERE
>>>>> { ?ass cv:avgSpeedSensor_Infrastructue ?r }
>>>>> }
>>>>> }
>>>>> GROUP BY ?r
>>>>> }
>>>>>
>>>>> The problem is that you use for what ever reason a sub-SELECT to get the
>>>>> ?ass value. But this value is not propagated to the outer query, thus,
>>>>> it's not bound to the INSERT part.
>>>>>
>>>>> Why not do it like here (note, I dPREFIX rdf:
>>>>> <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
>>>>> PREFIX cv:
>>>>> <http://www.semanticweb.org/toshiba/ontologies/2017/3/
>>>>>
>>>> untitled-ontology-6#>
>>>>
>>>>> INSERT {
>>>>> ?ass cv:recorded_speed ?avg .
>>>>> }
>>>>> WHERE
>>>>> { SELECT ?ass (AVG(?speed) AS ?avg)
>>>>> WHERE
>>>>> { ?v cv:vehicleSpeed ?speed ;
>>>>> cv:Vehicle_Road ?r .
>>>>> ?ass cv:avgSpeedSensor_Infrastructue ?r
>>>>> }
>>>>> GROUP BY ?r ?ass
>>>>> }on't know why you group by ?r instead of ?ass, thus, added both):
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On 09.06.2017 14:22, Aya Hamdy wrote:
>>>>>
>>>>>> Didn't know attachments are not allowed.
>>>>>> This is a gist of the three files.
>>>>>> https://gist.github.com/AyazzHamdy/faa14ebf46b0fe32689edc808dbf85d9
>>>>>>
>>>>>> The code files are minimalist as you can see on the gist. Only the
>>>>>>
>>>>> query is
>>>>> included and everything else is removed. I wanted to attach them as
>>>>> files
>>>>> to avoid clutter in the email. I believe things are more organized this
>>>>> way.
>>>>>> The problem is in b.java file. The c.java file is just to prove that
>>>>>> the
>>>>>> individual parts of the query work together. And the OWL file is the
>>>>>> one
>>>>>> generated by Protege. It has no problems, but I have removed anything
>>>>>>
>>>>> that
>>>>> is not needed for this specific query.
>>>>>> I have also attached a file called "ont.owl (full)" which has the full
>>>>>> ontology in case it is needed (which I think it is not needed, but just
>>>>>>
>>>>> in
>>>>> case I misunderstand).
>>>>>> Regards,
>>>>>>
>>>>>> On Fri, Jun 9, 2017 at 8:47 AM, Andy Seaborne <a...@apache.org> wrote:
>>>>>>
>>>>>> Attachments don't get through to this list.
>>>>>>> Put them in a pastebin or guithub gist.
>>>>>>>
>>>>>>> However, if they are so large that inlining email in plain text is
>>>>>>> impractical, than it suggests they are not minimal.
>>>>>>>
>>>>>>> Andy
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On 09/06/17 07:06, Lorenz Buehmann wrote:
>>>>>>>
>>>>>>> You forgot the attachments...
>>>>>>>>
>>>>>>>> On 09.06.2017 03:02, Aya Hamdy wrote:
>>>>>>>>
>>>>>>>> Attached is a file of my code and my ontology which I have imported
>>>>>>>> on
>>>>> Eclipse.
>>>>>>>>> I have finally fixed the null values issue. I am not sure if I
>>>>>>>>> understood the cause of the nulls correctly. However, it got fixed
>>>>>>>>> when I used a different way of making the ResultSet as shown below:
>>>>>>>>>
>>>>>>>>> Query query = QueryFactory.create(queryString1);
>>>>>>>>> QueryExecution qexec= QueryExecutionFactory.create(query,
>>>>>>>>> ontologyModel);
>>>>>>>>> ResultSet results=qexec.execSelect();
>>>>>>>>> ResultSetFormatter.out(System.out, results, query);
>>>>>>>>> qexec.close();
>>>>>>>>> I am including this bit of code here in case this helps someone else
>>>>>>>>> in the future cause I could not find it easily. It can be found in
>>>>>>>>> context in the attached c.java file.
>>>>>>>>>
>>>>>>>>> However, the original bigger problem still persists. The insert
>>>>>>>>>
>>>>>>>> SPARQL
>>>>> query still does not result in inserting the new desired subject
>>>>>>>>> predicate object triple. No errors are generated which is I suppose
>>>>>>>>> a
>>>>>>>>> good thing, but when I print the ontology after running the query, I
>>>>>>>>> can see that the new triples are not added.
>>>>>>>>>
>>>>>>>>> Attached is the owl file and the java file (b.java). I have added
>>>>>>>>> explanatory comments in the java file hoping to clarify what I am
>>>>>>>>> trying to do here.
>>>>>>>>>
>>>>>>>>> Also, hoping to clarify matters a bit more, I have two average speed
>>>>>>>>> sensors (speedSensor1 and speedSensor2) and I have two vehicles
>>>>>>>>> (vehicle1 and vehicle2). speedSensor1 is attached to Road1 and
>>>>>>>>> speedSensor2 is attached to Road2. vehicle1 is located on Road1
>>>>>>>>> with
>>>>>>>>> vehicleSpeed of 0 and vehicle2 is located on Road2 with
>>>>>>>>> vehicleSpeed
>>>>>>>>> of 50. Only one vehicle is modeled to be located on each road in an
>>>>>>>>> attempt to simplify things for now.
>>>>>>>>>
>>>>>>>>> The goal is to calculate the average of speeds of all vehicles on
>>>>>>>>> road1 and assign it as the value of the object property called
>>>>>>>>> recorded_speed of the speed sensor attached to the road which the
>>>>>>>>> vehicles are on. Consequently, based on my modeling, after running
>>>>>>>>> the query, speedSensor1 should have recorded_speed of 0 (since only
>>>>>>>>> vehicle1 is on road1 to which speedSensor1 is attached and vehicle1
>>>>>>>>> has speed of 0) and speedSensor2 should have recorded_speed of 50
>>>>>>>>> (since only vehicle2 is on road2 to which speedSensor2 is attached
>>>>>>>>>
>>>>>>>> and
>>>>> vehicle2 has speed of 50).
>>>>>>>>> Also, attached is another java file (c.java) that has the results of
>>>>>>>>> me breaking down the big query in b.java.
>>>>>>>>> My suspicion is that the part where I am trying to invoke the insert
>>>>>>>>> query is not working, but the way I built is based on StackOverflow
>>>>>>>>> and it was supposedly working fine, so I am not sure what I am
>>>>>>>>>
>>>>>>>> missing.
>>>>>>>>> Hope this gives you a picture of what is going on and hope you can
>>>>>>>>> help me understand why I cannot get the query to update the
>>>>>>>>> ontology.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Thu, Jun 8, 2017 at 5:29 PM, Lorenz Buehmann
>>>>>>>>> <buehm...@informatik.uni-leipzig.de
>>>>>>>>> <mailto:buehm...@informatik.uni-leipzig.de>> wrote:
>>>>>>>>>
>>>>>>>>> If results are bound it can't be a null value. Please show
>>>>>>>>> your
>>>>>>>>> updated
>>>>>>>>> code.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On 07.06.2017 14:58, Aya Hamdy wrote:
>>>>>>>>> > Sorry about the x, It was a stupid mistake. But it is nit
>>>>>>>>> the
>>>>>>>>> cause of the
>>>>>>>>> > null. When I fixed it, the results of even the simplest
>>>>>>>>>
>>>>>>>> queries
>>>>> are still
>>>>>>>>> > nulls.
>>>>>>>>> >
>>>>>>>>> > The code is not generating errors though, it is not
>>>>>>>>> generating
>>>>>>>>> the proper
>>>>>>>>> > results ...
>>>>>>>>> >
>>>>>>>>> > On Tue, Jun 6, 2017 at 9:13 AM, Andy Seaborne <
>>>>>>>>>
>>>>>>>> a...@apache.org
>>>>> <mailto:a...@apache.org>> wrote:
>>>>>>>>> >
>>>>>>>>> >>
>>>>>>>>> >> On 06/06/17 00:26, Aya Hamdy wrote:
>>>>>>>>> >>
>>>>>>>>> >>> Ok. That sounds reasonable so I will work on breaking down
>>>>>>>>>
>>>>>>>> my
>>>>> chain of
>>>>>>>>> >>> thought into smaller pieces. Thank you so much.
>>>>>>>>> >>>
>>>>>>>>> >>> I saw an example online where the query syntax is written
>>>>>>>>>
>>>>>>>> as a
>>>>> string on
>>>>>>>>> >>> Jena. so my query now looks like this:
>>>>>>>>> >>>
>>>>>>>>> >> Use
>>>>>>>>> >>
>>>>>>>>> >> String.join("\n"
>>>>>>>>> >> , "PREFIX rdf:<http://www.w3.org/1999/
>>>>>>>>>
>>>>>>>> 02/22-rdf-syntax-ns#
>>>>> <http://www.w3.org/1999/02/22-rdf-syntax-ns#>>"
>>>>>>>>> >> , "PREFIX rdf:<http://www.w3.org/1999/
>>>>>>>>>
>>>>>>>> 02/22-rdf-syntax-ns#
>>>>> <http://www.w3.org/1999/02/22-rdf-syntax-ns#>>"
>>>>>>>>> >> , "INSERT {",
>>>>>>>>> >> ...
>>>>>>>>> >> , "}"
>>>>>>>>> >> );
>>>>>>>>> >>
>>>>>>>>> >> then you will have newlines in the string and parser errors
>>>>>>>>> will have
>>>>>>>>> >> line+column numbers that are useful.
>>>>>>>>> >>
>>>>>>>>> >> Andy
>>>>>>>>> >>
>>>>>>>>> >>
>>>>>>>>> >>
>>>>>>>>> >>> String queryString=
>>>>>>>>> >>> "PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#
>>>>>>>>> <http://www.w3.org/1999/02/22-rdf-syntax-ns#>>"+
>>>>>>>>> >>> "PREFIX cv:<
>>>>>>>>> >>>
>>>>>>>>> http://www.semanticweb.org/toshiba/ontologies/2017/3/untitl
>>>>>>>>> ed-ontology-6#
>>>>>>>>> <http://www.semanticweb.org/toshiba/ontologies/2017/3/untit
>>>>>>>>> led-ontology-6#>
>>>>>>>>> >>>> "+
>>>>>>>>> >>> "insert {"+
>>>>>>>>> >>> " ?ass cv:recorded_speed ?avg"+
>>>>>>>>> >>> "}"+
>>>>>>>>> >>> "WHERE {"+
>>>>>>>>> >>> "SELECT (AVG(?speed) AS ?avg) "+
>>>>>>>>> >>> "where{"+
>>>>>>>>> >>> " ?v rdf:type cv:Vehicle ;"+
>>>>>>>>> >>> "cv:vehicleSpeed ?speed;"+
>>>>>>>>> >>> " cv:Vehicle_Road ?r;"+
>>>>>>>>> >>> "{"+
>>>>>>>>> >>>
>>>>>>>>> >>> "SELECT ?r"+
>>>>>>>>> >>> "where{"+
>>>>>>>>> >>>
>>>>>>>>> >>> "?ass rdf:type cv:Avg_Speed_Sensor;"+
>>>>>>>>> >>> " cv:avgSpeedSensor_Infrastructure ?r"+
>>>>>>>>> >>> "}"+
>>>>>>>>> >>> "}"+
>>>>>>>>> >>>
>>>>>>>>> >>>
>>>>>>>>> >>>
>>>>>>>>> >>> "}"+"GROUP By ?ass ?avg ?r"+
>>>>>>>>> >>> "}";
>>>>>>>>> >>>
>>>>>>>>> >>> Then, also based on my research, I feed the query string
>>>>>>>>>
>>>>>>>> into
>>>>> the parser
>>>>>>>>> >>> and output the model.
>>>>>>>>> >>> UpdateAction.parseExecute( queryString, ontologyModel );
>>>>>>>>> >>> ontologyModel.write( System.out, "TTL" );
>>>>>>>>> >>> I encountered many errors but managed to get rid of them
>>>>>>>>>
>>>>>>>> all.
>>>>> However,
>>>>>>>>> >>> based on the output, nothing has changed. speedSensor1
>>>>>>>>> and
>>>>>>>>> speedSensor2
>>>>>>>>> >>> do
>>>>>>>>> >>> not have the recorded_speed property added.
>>>>>>>>> >>>
>>>>>>>>> >>> Of course, I tried debugging, but I could not get any
>>>>>>>>> understanding of the
>>>>>>>>> >>> problem.
>>>>>>>>> >>>
>>>>>>>>> >>>
>>>>>>>>> >>> I tried breaking the query down to smaller bits right down
>>>>>>>>>
>>>>>>>> to
>>>>> doing a
>>>>>>>>> >>> simple select on vehicles:
>>>>>>>>> >>>
>>>>>>>>> >>> String query1=
>>>>>>>>> >>> "PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#
>>>>>>>>> <http://www.w3.org/1999/02/22-rdf-syntax-ns#>>"+
>>>>>>>>> >>> "PREFIX cv:<
>>>>>>>>> >>>
>>>>>>>>> http://www.semanticweb.org/toshiba/ontologies/2017/3/untitl
>>>>>>>>> ed-ontology-6#
>>>>>>>>> <http://www.semanticweb.org/toshiba/ontologies/2017/3/untit
>>>>>>>>> led-ontology-6#>
>>>>>>>>> >>>> "+
>>>>>>>>> >>> "Select ?v"+
>>>>>>>>> >>> "where {"+
>>>>>>>>> >>> "?v cv:vehicleSpeed ?speed."+
>>>>>>>>> >>> "}";
>>>>>>>>> >>>
>>>>>>>>> >>> Query query = QueryFactory.create(query1);
>>>>>>>>> >>> QueryExecution qexec= QueryExecutionFactory.create(query,
>>>>>>>>> ontologyModel);
>>>>>>>>> >>> try{
>>>>>>>>> >>> ResultSet results=qexec.execSelect();
>>>>>>>>> >>> while(results.hasNext()){
>>>>>>>>> >>> QuerySolution soln=results.nextSolution();
>>>>>>>>> >>> org.apache.jena.rdf.model.Literal name =
>>>>>>>>>
>>>>>>>> soln.getLiteral("x");
>>>>> >>> System.out.println(name);
>>>>>>>>> >>> }
>>>>>>>>> >>> }finally{
>>>>>>>>> >>> qexec.close();
>>>>>>>>> >>> }
>>>>>>>>> >>> But everything I have tried yields in the result "null".
>>>>>>>>> >>>
>>>>>>>>> >>> Can you give me pointers on how I should go about trying
>>>>>>>>> to
>>>>>>>>> figure out the
>>>>>>>>> >>> problem with the insert function?
>>>>>>>>> >>> Sorry if my questions are too naive, but I am trying to
>>>>>>>>>
>>>>>>>> grasp
>>>>> the concepts
>>>>>>>>> >>> as much as possible.
>>>>>>>>> >>>
>>>>>>>>> >>> Best Regards,
>>>>>>>>> >>> Aya
>>>>>>>>> >>>
>>>>>>>>> >>>
>>>>>>>>> >>>
>>>>>>>>> >>>
>>>>>>>>> >>> On Mon, Jun 5, 2017 at 8:32 PM, Andy Seaborne <
>>>>>>>>>
>>>>>>>> a...@apache.org
>>>>> <mailto:a...@apache.org>> wrote:
>>>>>>>>> >>>
>>>>>>>>> >>> Then find the sensor of interest, and all cars on that
>>>>>>>>> given
>>>>>>>>> road.
>>>>>>>>> >>>> GROUP BY the speed sensor, and the AVG is that of calls
>>>>>>>>> on
>>>>>>>>> that given
>>>>>>>>> >>>> road.
>>>>>>>>> >>>>
>>>>>>>>> >>>> The way to develop complex queris is to write simple
>>>>>>>>> parts,
>>>>>>>>> then combine
>>>>>>>>> >>>> them.
>>>>>>>>> >>>>
>>>>>>>>> >>>> Andy
>>>>>>>>> >>>>
>>>>>>>>> >>>>
>>>>>>>>> >>>> On 05/06/17 16:46, Aya Hamdy wrote:
>>>>>>>>> >>>>
>>>>>>>>> >>>> The goal is not to calculate the avg speed of a car. It
>>>>>>>>> is
>>>>>>>>> rather to
>>>>>>>>> >>>>> compute the avg speed of all the cars on a given road
>>>>>>>>> and
>>>>>>>>> assign that
>>>>>>>>> >>>>> computed average as the reading of the average speed
>>>>>>>>>
>>>>>>>> sensot
>>>>> attached to
>>>>>>>>> >>>>> that road.
>>>>>>>>> >>>>>
>>>>>>>>> >>>>> Sorry if my wording is causing confusion.
>>>>>>>>> >>>>>
>>>>>>>>> >>>>> On Jun 5, 2017 5:12 PM, "Lorenz Buehmann" <
>>>>>>>>> >>>>> buehm...@informatik.uni-leipzig.de
>>>>>>>>> <mailto:buehm...@informatik.uni-leipzig.de>> wrote:
>>>>>>>>> >>>>>
>>>>>>>>> >>>>> No, why do you think so? ?v is the variable that gets
>>>>>>>>> assigned a vehicle
>>>>>>>>> >>>>>
>>>>>>>>> >>>>>> for which you compute the avg speed.
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>> <Instance> should be ?v, i.e. you have to group by it
>>>>>>>>> and
>>>>>>>>> select it
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>> INSERT {
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>> ?v :avgSpeed ?avg
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>> } WHERE {
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>> SELECT ?v (AVG(?speed) AS ?avg) {
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>> ....
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>> } GROUP BY ?v
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>> }
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>> On 05.06.2017 17:03, Aya Hamdy wrote:
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>> Hello,
>>>>>>>>> >>>>>>> I will try to explain with examples. I have generated
>>>>>>>>> my
>>>>>>>>> ontology from
>>>>>>>>> >>>>>>> Protege and converted it to turtle syntax via an
>>>>>>>>> online
>>>>>>>>> tool.
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> *I have a class for average speed sensors:*
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> ###
>>>>>>>>> >>>>>>> http://www.semanticweb.org/toshiba/ontologies/2017/3/
>>>>>>>>> <http://www.semanticweb.org/toshiba/ontologies/2017/3/>
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> untitled-ontology-6#Avg_Speed_Sensor
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>>> untitled-ontology-6:Avg_Speed_Sensor rdf:type
>>>>>>>>>
>>>>>>>> owl:Class ;
>>>>> >>>>>>>
>>>>>>>>> >>>>>>> rdfs:subClassOf
>>>>>>>>> >>>>>>> untitled-ontology-6:Sensor ,
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> untitled-ontology-6:Speed_Sensor .
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> *and a class for vehicles:*
>>>>>>>>> >>>>>>> ###
>>>>>>>>> >>>>>>> http://www.semanticweb.org/toshiba/ontologies/2017/3/
>>>>>>>>> <http://www.semanticweb.org/toshiba/ontologies/2017/3/>
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> untitled-ontology-6#Vehicle
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>>> untitled-ontology-6:Vehicle rdf:type owl:Class .
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> *The vehicle class has a property called
>>>>>>>>> vehicleSpeed:*
>>>>>>>>> >>>>>>> ###
>>>>>>>>> >>>>>>> http://www.semanticweb.org/toshiba/ontologies/2017/3/
>>>>>>>>> <http://www.semanticweb.org/toshiba/ontologies/2017/3/>
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> untitled-ontology-6#vehicleSpeed
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>>> untitled-ontology-6:vehicleSpeed rdf:type
>>>>>>>>> owl:DatatypeProperty ;
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> rdfs:domain
>>>>>>>>> >>>>>>> untitled-ontology-6:Vehicle
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> ;
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>>> rdfs:range
>>>>>>>>>
>>>>>>>> xsd:integer .
>>>>> >>>>>>>
>>>>>>>>> >>>>>>> *The avg speed sensor class has a property called
>>>>>>>>> recorded_speed:*
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> ###
>>>>>>>>> >>>>>>> http://www.semanticweb.org/toshiba/ontologies/2017/3/
>>>>>>>>> <http://www.semanticweb.org/toshiba/ontologies/2017/3/>
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> untitled-ontology-6#recorded_speed
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>>> untitled-ontology-6:recorded_speed rdf:type
>>>>>>>>> owl:DatatypeProperty ;
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> rdfs:domain
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> untitled-ontology-6:Sensor ,
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>>> untitled-ontology-6:Speed_Sensor ;
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> rdfs:range
>>>>>>>>>
>>>>>>>> xsd:integer
>>>>> .
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> The recorded speed by the avg speed sensor allocated
>>>>>>>>> to
>>>>>>>>>
>>>>>>>> a
>>>>> specific
>>>>>>>>> >>>>>>> road
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> is
>>>>>>>>> >>>>>> the average of the vehicleSpeeds of the vehicles on
>>>>>>>>> that
>>>>>>>>> specific road,
>>>>>>>>> >>>>>>> where the avg speed sensor class has a property called
>>>>>>>>> >>>>>>> avgSpeedSensor_Infrastructure and the vehicle has a
>>>>>>>>> property called
>>>>>>>>> >>>>>>> Vehicle_Road.
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> I have two vehicle instances: Vehicle1 and Vehicle2;
>>>>>>>>> and
>>>>>>>>> two sensor
>>>>>>>>> >>>>>>> instances: SpeedSensor1 and SpeedSensor2.
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> Is it clearer now or just confusing?
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> so I am guessing following your guide it would be
>>>>>>>>> something like:
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> INSERT {
>>>>>>>>> >>>>>>> <instance> :avgSpeed ?avg
>>>>>>>>> >>>>>>> }
>>>>>>>>> >>>>>>> WHERE {
>>>>>>>>> >>>>>>> SELECT (AVG(?speed) AS ?avg) {
>>>>>>>>> >>>>>>> ?v rdf:type :Vehicle ;
>>>>>>>>> >>>>>>> :vehicleSpeed ?speed;
>>>>>>>>> >>>>>>> : Vehicle_Road ?r;
>>>>>>>>> >>>>>>> ?avs rdf:type :Avg_Speed_Sensor;
>>>>>>>>> >>>>>>> :avgSpeedSensor_Infrastructure ?r
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> }
>>>>>>>>> >>>>>>> }
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> But the value of the <instance> should come from
>>>>>>>>>
>>>>>>>> reading
>>>>> the file,
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> right?
>>>>>>>>> >>>>>>
>>>>>>>>> >>>>>>> On Sun, Jun 4, 2017 at 9:04 PM, Andy Seaborne
>>>>>>>>> <a...@apache.org <mailto:a...@apache.org>>
>>>>>>>>> >>>>>>> wrote:
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>>
>>>>>>>>> >>>>>>> On 04/06/17 18:47, Aya Hamdy wrote:
>>>>>>>>> >>>>>>>> Hello,
>>>>>>>>> >>>>>>>>
>>>>>>>>> >>>>>>>>> I wanted to add a property called avgSpeed to an
>>>>>>>>> instance of a class
>>>>>>>>> >>>>>>>>> called
>>>>>>>>> >>>>>>>>> FlowSensor. This property should be the average of
>>>>>>>>> the
>>>>>>>>> values of the
>>>>>>>>> >>>>>>>>> property vehicleSpeed attached to instances of the
>>>>>>>>>
>>>>>>>> class
>>>>> Vehicle.
>>>>>>>>> >>>>>>>>>
>>>>>>>>> >>>>>>>>> I read that SPARQL update allows doing this.
>>>>>>>>> However,
>>>>>>>>>
>>>>>>>> I
>>>>> cannot reach
>>>>>>>>> >>>>>>>>>
>>>>>>>>> >>>>>>>>> the
>>>>>>>>> >>>>>> syntax for doing the* averaging of values* or for
>>>>>>>>>
>>>>>>>> building
>>>>> the *SPARQL
>>>>>>>>> >>>>>>>> Update *query using jena with eclipse on the jena
>>>>>>>>>
>>>>>>>> website.
>>>>> >>>>>>>>> If Jena indeed supports doing what I intend to do then
>>>>>>>>> can someone
>>>>>>>>> >>>>>>>>>
>>>>>>>>> >>>>>>>>> point
>>>>>>>>> >>>>>> out some sources to guide me in my attempt?
>>>>>>>>> >>>>>>>>> Best Regards,
>>>>>>>>> >>>>>>>>> Aya
>>>>>>>>> >>>>>>>>>
>>>>>>>>> >>>>>>>>>
>>>>>>>>> >>>>>>>>> Calculate the average in a nested select so
>>>>>>>>> somethign
>>>>>>>>> like (you'll
>>>>>>>>> >>>>>>>>>
>>>>>>>>> >>>>>>>> have
>>>>>>>>> >>>>>>>>
>>>>>>>>> >>>>>>>> to
>>>>>>>>> >>>>>> fix this up):
>>>>>>>>> >>>>>>>> INSERT {
>>>>>>>>> >>>>>>>> <instance> :avgSpeed ?avg
>>>>>>>>> >>>>>>>> }
>>>>>>>>> >>>>>>>> WHERE {
>>>>>>>>> >>>>>>>> SELECT (AVG(?speed) AS ?avg) {
>>>>>>>>> >>>>>>>> ?v rdf:type :Vehicle ;
>>>>>>>>> >>>>>>>> :vehicleSpeed ?speed
>>>>>>>>> >>>>>>>> }
>>>>>>>>> >>>>>>>> }
>>>>>>>>> >>>>>>>>
>>>>>>>>> >>>>>>>> By the way - it is better to more concrete in your
>>>>>>>>> description -
>>>>>>>>> >>>>>>>> actual
>>>>>>>>> >>>>>>>> data for example.
>>>>>>>>> >>>>>>>>
>>>>>>>>> >>>>>>>>
>>>>>>>>> >>>>>>>>
>>>>>>>>> >>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>
--
Lorenz Bühmann
AKSW group, University of Leipzig
Group: http://aksw.org - semantic web research center
