Help in writting Sparql Queries

[R A J E E V Santhirarasa]

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Hi

I am having problem writing sparql query from an ontology that I created in Protégé 3.3.1.

 

Class:

Laptops

   String – name

   Float – weight

 

CPU

    String – name

    Float –  speed

    Int – cache

   

name, speed, cache and weight have been defined as datatype properties.

has_CPU is defined as object property

 

Laptops has_CPU CPU

 

 

Is it possible to write a query to access or list the datatype property of the CPU instance with the (above) given information?

 

For example: I am trying to write a sparql query to

List all laptops that has cpu speed greater than or equal to  1.5?

 

Thank You
Rajeev Santhirarasa

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[Thomas Russ]

The fundamental problem with using SPARQL to query an OWL ontology is  
that SPARQL works on the serialized structure of the tuples, and there  
are several structurally different but semantically equivalent ways to  
serialize an OWL expression.

You are better off doing this with an OWL-aware query language like  
SQWRL.

You can search the mail archives for more information.


On Jul 23, 2008, at 6:25 PM, R A J E E V Santhirarasa wrote:

> Hi
> I am having problem writing sparql query from an ontology that I  
> created in Protégé MailScanner has detected a possible fraud attempt  
> from "3.3.1." claiming to be 3.3.1.
>
> Class:
> Laptops
>    String – name
>    Float – weight
>
> CPU
>     String – name
>     Float –  speed
>     Int – cache
>
> name, speed, cache and weight have been defined as datatype  
> properties.
> has_CPU is defined as object property
>
> Laptops has_CPU CPU
>
>
> Is it possible to write a query to access or list the datatype  
> property of the CPU instance with the (above) given information?
>
> For example: I am trying to write a sparql query to
> List all laptops that has cpu speed greater than or equal to  1.5?
>
>
> Thank You
> Rajeev Santhirarasa
> _______________________________________________
> protege-owl mailing list
> protege-owl@...
> https://mailman.stanford.edu/mailman/listinfo/protege-owl
>
> Instructions for unsubscribing: http://protege.stanford.edu/doc/faq.html#01a.03

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[James Howison-3]

On Jul 23, 2008, at 10:37 PM, Thomas Russ wrote:

> The fundamental problem with using SPARQL to query an OWL ontology is
> that SPARQL works on the serialized structure of the tuples, and there
> are several structurally different but semantically equivalent ways to
> serialize an OWL expression.
>
> You are better off doing this with an OWL-aware query language like
> SQWRL.

Is there a useful reference for understanding this more? I guess I'm  
not sure the details of how this plays out once an OWL-aware reasoner,  
like Pellet, is in the picture.

> You can search the mail archives for more information.

Rajeev, the best way to get a feel for writing SPARQL queries is to  
look at your knowledge base in n3/Turtle format.  Nonetheless I'll  
give it a shot:

PREFIX yourNS: <http://your.namespace.com/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
SELECT ?laptop_url ?name
WHERE {
   ?laptop_url yourNS:has_CPU  ?cpu .
   ?cpu        yourNS:speed    ?speed ;
               yourNS:name     ?name .
   FILTER ( ?speed > "1.5"^^xsd:float )
}

Realize, of course, that each of the triples in this query must be 'in  
the model', which is to say that if they are entailments of OWL  
statements you must be using (or have used and saved the results of)  
an adequate reasoner.  The FILTER is applied against each set of  
statements that match the top part of the query, and results where  
the ?speed field doesn't meet the condition are dropped before the  
results are returned.

--J

>
>
> On Jul 23, 2008, at 6:25 PM, R A J E E V Santhirarasa wrote:
>
>> Hi
>> I am having problem writing sparql query from an ontology that I
>> created in Protégé MailScanner has detected a possible fraud attempt
>> from "3.3.1." claiming to be 3.3.1.
>>
>> Class:
>> Laptops
>>   String – name
>>   Float – weight
>>
>> CPU
>>    String – name
>>    Float –  speed
>>    Int – cache
>>
>> name, speed, cache and weight have been defined as datatype
>> properties.
>> has_CPU is defined as object property
>>
>> Laptops has_CPU CPU
>>
>>
>> Is it possible to write a query to access or list the datatype
>> property of the CPU instance with the (above) given information?
>>
>> For example: I am trying to write a sparql query to
>> List all laptops that has cpu speed greater than or equal to  1.5?
>>
>>
>> Thank You
>> Rajeev Santhirarasa
>> _______________________________________________
>> protege-owl mailing list
>> protege-owl@...
>> https://mailman.stanford.edu/mailman/listinfo/protege-owl
>>
>> Instructions for unsubscribing: http://protege.stanford.edu/doc/faq.html#01a.03
>
> _______________________________________________
> protege-owl mailing list
> protege-owl@...
> https://mailman.stanford.edu/mailman/listinfo/protege-owl
>
> Instructions for unsubscribing: http://protege.stanford.edu/doc/faq.html#01a.03
>

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[Pitonyak, Andrew D]

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I see that you already have replies, so I will leave you with a link

 

You need to use “Filter”.

 

http://www.w3.org/TR/rdf-sparql-query/

 

http://jena.sourceforge.net/ARQ/Tutorial/

 

http://www.ibm.com/developerworks/xml/library/j-sparql/

 

 

 

---

From: protege-owl-bounces@... [mailto:protege-owl-bounces@...] On Behalf Of R A J E E V Santhirarasa
Sent: Wednesday, July 23, 2008 9:26 PM
To: User support for the Protege-OWL editor
Subject: [protege-owl] Help in writting Sparql Queries

 

Hi

I am having problem writing sparql query from an ontology that I created in Protégé 3.3.1.

 

Class:

Laptops

   String – name

   Float – weight

 

CPU

    String – name

    Float –  speed

    Int – cache

   

name, speed, cache and weight have been defined as datatype properties.

has_CPU is defined as object property

 

Laptops has_CPU CPU

 

 

Is it possible to write a query to access or list the datatype property of the CPU instance with the (above) given information?

 

For example: I am trying to write a sparql query to

List all laptops that has cpu speed greater than or equal to  1.5?

 

Thank You
Rajeev Santhirarasa

_______________________________________________
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protege-owl@...
https://mailman.stanford.edu/mailman/listinfo/protege-owl

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[R A J E E V Santhirarasa]

Thank you all for your help.

On Thu, Jul 24, 2008 at 10:00 AM, Pitonyak, Andrew D <PitonyakA@...> wrote:

 

I see that you already have replies, so I will leave you with a link

 

You need to use "Filter".

 

http://www.w3.org/TR/rdf-sparql-query/

 

http://jena.sourceforge.net/ARQ/Tutorial/

 

http://www.ibm.com/developerworks/xml/library/j-sparql/

 

 

 

---

From: protege-owl-bounces@... [mailto:protege-owl-bounces@...] On Behalf Of R A J E E V Santhirarasa
Sent: Wednesday, July 23, 2008 9:26 PM
To: User support for the Protege-OWL editor
Subject: [protege-owl] Help in writting Sparql Queries

 

Hi

I am having problem writing sparql query from an ontology that I created in Protégé 3.3.1.

 

Class:

Laptops

   String – name

   Float – weight

 

CPU

    String – name

    Float –  speed

    Int – cache

   

name, speed, cache and weight have been defined as datatype properties.

has_CPU is defined as object property

 

Laptops has_CPU CPU

 

 

Is it possible to write a query to access or list the datatype property of the CPU instance with the (above) given information?

 

For example: I am trying to write a sparql query to

List all laptops that has cpu speed greater than or equal to  1.5?

 

Thank You
Rajeev Santhirarasa

_______________________________________________
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protege-owl@...
https://mailman.stanford.edu/mailman/listinfo/protege-owl

Instructions for unsubscribing: http://protege.stanford.edu/doc/faq.html#01a.03

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