Try a SELECT first and see what values you get:
SELECT *
WHERE
{
?olds a owl:NamedIndividual, skos:Concept ;
?p ?o .
BIND(CONCAT(CONCAT(STRBEFORE(?olds, "#"), "#"), STRUUID()) AS ?snew) .
}
If ?snew is not bound to any values, it will not generate any triples
in CONSTRUCT.
On Thu, Nov 3, 2016 at 5:42 PM, Mahmood Ahmad
<[email protected]> wrote:
> Thanks, but this wouldn't generate any results either:
>
> CONSTRUCT {
> ?snew a owl:NamedIndividual, skos:Concept ;
> ?p ?o .
> }
> WHERE
> {
> ?olds a owl:NamedIndividual, skos:Concept ;
> ?p ?o .
> BIND(CONCAT(CONCAT(STRBEFORE(?olds, "#"), "#"), STRUUID()) AS ?snew) .
> }
>
> -----Original Message-----
> From: Martynas Jusevičius [mailto:[email protected]]
> Sent: 03 November 2016 16:32
> To: [email protected]
> Subject: Re: Adding UUIDs to SPARQL query results
>
> You have to use ?snew variable instead of ?olds in the CONSTRUCT template,
> otherwise it will have no effect:
>
> CONSTRUCT {
> ?snew a owl:NamedIndividual, skos:Concept ;
> ?p ?o .
> }
>
> On Thu, Nov 3, 2016 at 5:28 PM, Mahmood Ahmad <[email protected]>
> wrote:
>> Many thanks. I have been trying this but seem to miss some trick:
>>
>> From my CONSTRUCT query:
>>
>> PREFIX owl: <http://www.w3.org/2002/07/owl#> PREFIX xsd:
>> <http://www.w3.org/2001/XMLSchema#>
>> PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
>> prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
>> prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
>> PREFIX www: <http://xyz.com#>
>>
>> CONSTRUCT {
>> ?s a owl:NamedIndividual, skos:Concept ;
>> ?p ?o .
>> }
>> WHERE
>> {
>> ?s a owl:NamedIndividual, skos:Concept ;
>> ?p ?o .
>> }
>>
>> I get results of the following type (summarised because of file size).
>> www:Some_Identifier
>> a skos:Concept , owl:NamedIndividual ;
>> ?p ?o .
>>
>> I need to replace 'Some_Identifier' with a UUID generated by the STRUUID()
>> function. For this purpose I append the bind statement in a new CONSTRUCT
>> query as follow:
>>
>> CONSTRUCT {
>> ?olds a owl:NamedIndividual, skos:Concept ;
>> ?p ?o .
>> }
>> WHERE
>> {
>> ?olds a owl:NamedIndividual, skos:Concept ;
>> ?p ?o .
>> BIND(CONCAT(CONCAT(STRBEFORE(?olds, "#"), "#"), STRUUID()) AS ?snew) .
>> }
>>
>>
>> But this does not change anything. It looks as if I expect the variable
>> ?olds as a string whereas it is not. How can then I use the BIND() function
>> correctly to obtain this?
>>
>> One way may be to use STR(www:) and concatenate it with STRUUID(), but how
>> to place this in the sub-graph?
>>
>> Any idea, I'll appreciate.
>>
>> Regards
>> Mahmood
>>
>> -----Original Message-----
>> From: Martynas Jusevičius [mailto:[email protected]]
>> Sent: 03 November 2016 12:36
>> To: [email protected]
>> Subject: Re: Adding UUIDs to SPARQL query results
>>
>> Use BIND() with UUID() or STRUUID().
>>
>> https://www.w3.org/TR/2012/WD-sparql11-query-20120724/#func-uuid
>> https://www.w3.org/TR/2012/WD-sparql11-query-20120724/#func-struuid
>>
>> On Thu, Nov 3, 2016 at 1:34 PM, Mahmood Ahmad
>> <[email protected]> wrote:
>>> Hi,
>>>
>>> [Advanced apologies if this question is out of scope of this list,
>>> and advise me the correct forum.]
>>>
>>> I am currently using Apache Jena Fuseki 2.4.0 (Windows 10) to upload my
>>> project RDF triples into a big soup.
>>>
>>> Using the SPARQL CONSTRUCT queries, I am able to query sub-graphs from the
>>> big soup and the result is in Turtle format. However, I am looking to add a
>>> UUID to every result of my query.
>>>
>>> Is it possible to get this done within my CONSTRUCT query, and how? If not,
>>> please can you suggest some alternative approaches?
>>>
>>> Thanks and regards
>>> Mahmood
>>>
>>> ====================
>>> Dr Mahmood Ahmad
>>> KTP Associate
>>>
>>> School of Computer Science
>>> University of Manchester
>>> and
>>> Telematicus
>>> Newport Street
>>> Macclesfield
>>> SK11 6QJ
>>> United Kingdom
>>>
>>> E:
>>> [email protected]<mailto:[email protected]>
>>> E:
>>> [email protected]<mailto:[email protected]>
>>>
>>>
