Re: Sparql Update: Insert a property whose value is a calculated average

[Aya Hamdy]

Thanks! I wrote the file to a different path and imported it to eclipse and
finally, it has the new attributes.
Thank you, Lorenz for your help and patience for the past days, much
appreciated.

On Sun, Jun 11, 2017 at 12:01 PM, Lorenz B. <
buehm...@informatik.uni-leipzig.de> wrote:

> Please upload your update code for b.java
>
> And then try to write to another path instead of the same file, just to
> make sure that you really write to disk.
>
> > - I had included the writing to the file in b.java, but I must have
> dropped
> > it by mistake when putting the files as a gist, apologies.
> >
> > - I am not surprised with the output. Don't know why you got that
> > impression. You are right, it is my code so  I know what I have written
> and
> > I have made the output TTL for a reason for sure. It is neater to read in
> > the console as a personal preference.
> >
> >   -I used the system.write with the query you provided, I am using your
> > query for my trials with the file now. Note that your query is different
> > from the syntax I had tried before the sub-select by removing one of the
> > where clauses. I was treating the query too much like SQL syntax it
> seems,
> > so thx again for that.
> >
> > - I used writeall because in the original file, not the summarized
> > b.java one there are other inferences made, so it would have its uses.
> > Thanks for the update on the write syntax, I removed the xmlbase
> argument,
> > but still nothing.
> >
> > Finally, the file is not affected by the write although you tried it and
> it
> > worked with you, and we are working on the same files with the same
> > contents. so that is a whole other level of hopelessness. If it worked
> for
> > you then it should have worked with me.
> >
> > Anyway thanks for your efforts, it was much appreciated.
> >
> >
> >
> >
> >
> > On Jun 11, 2017 10:26 AM, "Lorenz B."  leipzig.de>
> > wrote:
> >
> >>
> >>> Yes, I see. I don't get why it does not add them when I run it...
> >>>
> >>> Do you see the new tuples when you print or when you open the file
> >> ontology
> >>> file? Cause with me, when I used your syntax, the new triples show in
> the
> >>> print but when I open the ontology file on Eclipse which I am running
> the
> >>> query on, I find that the triples are not added.
> >> As I said, I just used your code in b.java, thus, it's just printed to
> >> System.out .
> >>> And I have noticed that what you are showing me is in turtle format.
> The
> >>> ontology file is in XML format...
> >> The same, your code prints to System.out as "TTL" which is Turtle - I'm
> >> wondering why you're surprised, it's your code.
> >>> Isn't the result of the insertion
> >>> function written to the ontology file?
> >> No, the triples in the ontology are loaded into memory. That means you
> >> have to write the model back to disk
> >>>   Note that I have previously added
> >>> lines to my code to try and rewrite the ontology after the query, but
> the
> >>> file is still not affected:
> >> But you did this without the query that I provided?
> >>> FileOutputStream output = null;
> >>>
> >>> try  {
> >>>  output = new FileOutputStream( "yarab.owl ");
> >>> } catch(Exception e) {}
> >>>
> >>> ontologyModel.writeAll(output, "RDF/XML-ABBREV","xmlbase");
> >> Do you really want to use writeAll()? This also writes inferred and
> >> imported triples to disk. Otherwise, use write()
> >> And the argument "xmlbase" is for sure wrong. It expects the base URI of
> >> the XML (or Turtle) document if exist - you can also use NULL or simply
> >> use write(output, "RDF/XML-ABBREV")
> >>
> >>
> >>
> >> To sum up, writing to disk works for me as well. I don't see why this
> >> should not work if the INSERT already modified the model.
> >>
> >>>
> >>> PrintStream p= new PrintStream("yarab.owl");
> >>> ontologyModel.writeAll(p, "RDF/XML", null);
> >>> p.close();
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> On Sat, Jun 10, 2017 at 8:32 AM, Lorenz B. <
> >>> buehm...@informatik.uni-leipzig.de> wrote:
> >>>
>  That can't be. I tried your example b.java with my query
> 
>  PREFIX  rdf:  
>  PREFIX  cv:
>   >> ed-ontology-6#
>  INSERT {
>    ?ass cv:recorded_speed ?avg .
>  }
>  WHERE
>    { SELECT  ?ass (AVG(?speed) AS ?avg)
>  WHERE
>    { ?vcv: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 

Re: Sparql Update: Insert a property whose value is a calculated average

[Lorenz B.]

> Yes, I see. I don't get why it does not add them when I run it...
>
> Do you see the new tuples when you print or when you open the file ontology
> file? Cause with me, when I used your syntax, the new triples show in the
> print but when I open the ontology file on Eclipse which I am running the
> query on, I find that the triples are not added.
As I said, I just used your code in b.java, thus, it's just printed to
System.out .
>
> And I have noticed that what you are showing me is in turtle format. The
> ontology file is in XML format...
The same, your code prints to System.out as "TTL" which is Turtle - I'm
wondering why you're surprised, it's your code.
> Isn't the result of the insertion
> function written to the ontology file? 
No, the triples in the ontology are loaded into memory. That means you
have to write the model back to disk
>   Note that I have previously added
> lines to my code to try and rewrite the ontology after the query, but the
> file is still not affected:
But you did this without the query that I provided?
>
> FileOutputStream output = null;
>
> try  {
>  output = new FileOutputStream( "yarab.owl ");
> } catch(Exception e) {}
>
> ontologyModel.writeAll(output, "RDF/XML-ABBREV","xmlbase");
Do you really want to use writeAll()? This also writes inferred and
imported triples to disk. Otherwise, use write()
And the argument "xmlbase" is for sure wrong. It expects the base URI of
the XML (or Turtle) document if exist - you can also use NULL or simply
use write(output, "RDF/XML-ABBREV")



To sum up, writing to disk works for me as well. I don't see why this
should not work if the INSERT already modified the model.

>
>
> PrintStream p= new PrintStream("yarab.owl");
> ontologyModel.writeAll(p, "RDF/XML", null);
> p.close();
>
>
>
>
>
> On Sat, Jun 10, 2017 at 8:32 AM, Lorenz B. <
> buehm...@informatik.uni-leipzig.de> wrote:
>
>> That can't be. I tried your example b.java with my query
>>
>> PREFIX  rdf:  
>> PREFIX  cv:
>> > INSERT {
>>   ?ass cv:recorded_speed ?avg .
>> }
>> WHERE
>>   { SELECT  ?ass (AVG(?speed) AS ?avg)
>> WHERE
>>   { ?vcv: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"  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 

Re: Sparql Update: Insert a property whose value is a calculated average

[Lorenz B.]

That can't be. I tried your example b.java with my query

PREFIX  rdf:  
PREFIX  cv:  


INSERT {
  ?ass cv:recorded_speed ?avg .
}
WHERE
  { SELECT  ?ass (AVG(?speed) AS ?avg)
WHERE
  { ?vcv: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"  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:"+
>>> "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 "  "?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 

Re: Sparql Update: Insert a property whose value is a calculated average

[Aya Hamdy]

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"  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:"+
>> "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 "  "?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:  
>>> PREFIX  cv:
>>> >> ed-ontology-6#
>>>


>>> INSERT {
>>>?ass cv:recorded_speed ?avg .
>>> }
>>> WHERE
>>>{ SELECT  ?ass (AVG(?speed) AS ?avg)
>>>  WHERE
>>>{ ?vcv: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:  
 PREFIX  cv:
 >> 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:
 
 PREFIX  cv:
 

Re: Sparql Update: Insert a property whose value is a calculated average

[Andy Seaborne]

 " 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:"+
"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 "  "?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:  
PREFIX  cv:

PREFIX  cv:



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:

PREFIX  cv:



INSERT {
   ?ass cv:recorded_speed ?avg .
}
WHERE
   { SELECT  ?ass (AVG(?speed) AS ?avg)
 WHERE
   { ?vcv: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).

  

Re: Sparql Update: Insert a property whose value is a calculated average

[Aya Hamdy]

When I do not use the subselect and write the query this way:

String queryString1 =
"PREFIX rdf:"+
"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 "  "?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:  
> PREFIX  cv:
>  >
>
> INSERT {
>   ?ass cv:recorded_speed ?avg .
> }
> WHERE
>   { SELECT  ?ass (AVG(?speed) AS ?avg)
> WHERE
>   { ?vcv: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:  
> > PREFIX  cv:
> >  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:
> > 
> > PREFIX  cv:
> >  untitled-ontology-6#>
> >
> > INSERT {
> >   ?ass cv:recorded_speed ?avg .
> > }
> > WHERE
> >   { SELECT  ?ass (AVG(?speed) AS ?avg)
> > WHERE
> >   { ?vcv: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  wrote:
> >>
> >>> 

Re: Sparql Update: Insert a property whose value is a calculated average

[Lorenz Buehmann]

There was some formatting issue in my previous mail.

What I was wondering the need for grouping by ?r instead of ?ass.

PREFIX  rdf:  
PREFIX  cv:  


INSERT {
  ?ass cv:recorded_speed ?avg .
}
WHERE
  { SELECT  ?ass (AVG(?speed) AS ?avg)
WHERE
  { ?vcv: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:  
> PREFIX  cv:  
> 
>
> 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: 
> 
> PREFIX  cv:  
> 
>
> INSERT {
>   ?ass cv:recorded_speed ?avg .
> }
> WHERE
>   { SELECT  ?ass (AVG(?speed) AS ?avg)
> WHERE
>   { ?vcv: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  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 

Re: Sparql Update: Insert a property whose value is a calculated average

[Lorenz Buehmann]

That is your query:

PREFIX  rdf:  
PREFIX  cv:  


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: 

PREFIX  cv:  


INSERT {
  ?ass cv:recorded_speed ?avg .
}
WHERE
  { SELECT  ?ass (AVG(?speed) AS ?avg)
WHERE
  { ?vcv: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  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 

Re: Sparql Update: Insert a property whose value is a calculated average

[Aya Hamdy]

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  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
>>> >> > 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 >>  > wrote:
>>>  >
>>>  >>
>>>  >> On 06/06/17 00:26, Aya Hamdy wrote:
>>>  >>
>>>  >>> Ok. That sounds reasonable so I will 

Re: Sparql Update: Insert a property whose value is a calculated average

[Andy Seaborne]

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
> 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 > 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:>"
 >>, "PREFIX rdf:>"
 >>, "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:>"+
 >>> "PREFIX cv:<
 >>>
 http://www.semanticweb.org/toshiba/ontologies/2017/3/untitled-ontology-6#
 
  "+
 >>> "insert {"+
 >>> " ?ass cv:recorded_speed ?avg"+
 >>>"}"+
 >>> 

Re: Sparql Update: Insert a property whose value is a calculated average

[Lorenz Buehmann]

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
>  > 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  > 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: >"
> >>, "PREFIX rdf: >"
> >>, "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: >"+
> >>> "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{"+
> >>> 

Re: Sparql Update: Insert a property whose value is a calculated average

[Aya Hamdy]

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> 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  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:"
> >>, "PREFIX rdf:"
> >>, "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:"+
> >>> "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 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 

Re: Sparql Update: Insert a property whose value is a calculated average

[Lorenz Buehmann]

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  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:"
>>, "PREFIX rdf:"
>>, "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:"+
>>> "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 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:"+
>>> "PREFIX cv:<
>>> http://www.semanticweb.org/toshiba/ontologies/2017/3/untitled-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  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> wrote:
>
> No, why do you think so? ?v is the variable that gets assigned a vehicle
>
>> for which you compute the avg speed.
>>
>>  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:*
>>>
>>>###
>>> 

Re: Sparql Update: Insert a property whose value is a calculated average

[Aya Hamdy]

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  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:"
>, "PREFIX rdf:"
>, "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:"+
>> "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 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:"+
>> "PREFIX cv:<
>> http://www.semanticweb.org/toshiba/ontologies/2017/3/untitled-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  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> wrote:

 No, why do you think so? ?v is the variable that gets assigned a vehicle

> for which you compute the avg speed.
>
>  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/
>>
>> untitled-ontology-6#Avg_Speed_Sensor
>
>
>> untitled-ontology-6:Avg_Speed_Sensor rdf:type owl:Class ;
>>
>>rdfs:subClassOf
>> untitled-ontology-6:Sensor ,
>>
>>   

Re: Sparql Update: Insert a property whose value is a calculated average

[Andy Seaborne]

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:"
   , "PREFIX rdf:"
   , "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:"+
"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 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:"+
"PREFIX cv:<
http://www.semanticweb.org/toshiba/ontologies/2017/3/untitled-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  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> wrote:

No, why do you think so? ?v is the variable that gets assigned a vehicle

for which you compute the avg speed.

 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/


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/


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/


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/


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 ;

   

Re: Sparql Update: Insert a property whose value is a calculated average

[Aya Hamdy]

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:

String queryString=
"PREFIX rdf:"+
"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 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:"+
"PREFIX cv:<
http://www.semanticweb.org/toshiba/ontologies/2017/3/untitled-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  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> wrote:
>>
>> No, why do you think so? ?v is the variable that gets assigned a vehicle
>>> for which you compute the avg speed.
>>>
>>>  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/

>>> 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/

>>> 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/

>>> 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/

>>> 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 ;

Re: Sparql Update: Insert a property whose value is a calculated average

[Andy Seaborne]

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> wrote:


No, why do you think so? ?v is the variable that gets assigned a vehicle
for which you compute the avg speed.

 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/

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/

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/

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/

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 {
   :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   should come from reading the file,

right?



On Sun, Jun 4, 2017 at 9:04 PM, Andy Seaborne  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 {
   :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.

Re: Sparql Update: Insert a property whose value is a calculated average

[Aya Hamdy]

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> wrote:

> No, why do you think so? ?v is the variable that gets assigned a vehicle
> for which you compute the avg speed.
>
>  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/
> 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/
> 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/
> 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/
> 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 {
> >   :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   should come from reading the file,
> right?
> >
> >
> > On Sun, Jun 4, 2017 at 9:04 PM, Andy Seaborne  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 {
> >>   :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.
> >>
>
>

Re: Sparql Update: Insert a property whose value is a calculated average

[Lorenz Buehmann]

No, why do you think so? ?v is the variable that gets assigned a vehicle
for which you compute the avg speed.

 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/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/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/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/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 {
>   :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   should come from reading the file, right?
>
>
> On Sun, Jun 4, 2017 at 9:04 PM, Andy Seaborne  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 {
>>   :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.
>>

Re: Sparql Update: Insert a property whose value is a calculated average

[Aya Hamdy]

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/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/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/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/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 {
  :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   should come from reading the file, right?


On Sun, Jun 4, 2017 at 9:04 PM, Andy Seaborne  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 {
>   :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.
>

Re: Sparql Update: Insert a property whose value is a calculated average

[Andy Seaborne]

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 {
  :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.

Sparql Update: Insert a property whose value is a calculated average

[Aya Hamdy]

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