Hi Tony,
Of course, this would be the easy workaround. But since it is
possible to evaluate the query all at once, it would be good to be
able to do so.
Another workaround I thought about, is to use BIND in the query, to
create another placeholder out of ?s. For instance, change the
previous SPARQL query into:
SELECT * WHERE {
?s ?p ?o .
BIND(CONCAT(?s, "") as ?v)
}
This return a "v" in each result row, but it is then always null. The
following:
require('/MarkLogic/semantics').sparql(
'SELECT * WHERE { ?s ?p ?o . BIND(CONCAT(?s, "") as ?v) }',
{ 's': [ sem.iri('#1'), sem.iri('#2') ] })
returns an iterator to objects of the form:
{ p: "#pred", o: "value", v: null }
So it is not even usable either.
Regards,
--
Florent Georges
http://fgeorges.org/
http://h2oconsulting.be/
On 16 May 2016 at 10:51, Anthony Coates wrote:
> Classification: Public
>
> Hi Florent. Would it be a problem to just call the query (multiple times)
> with a single subject for each of the different subjects that you want, and
> then combine the results?
>
> Cheers, Tony.
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Florent Georges
> Sent: 15 May 2016 12:42
> To: MarkLogic Developer Discussion <[email protected]>
> Subject: [MarkLogic Dev General] sem.sparql: get bound placeholders in the
> result
>
> Hi,
>
> Using `sem.sparql()`, it is possible to bind a SPARQL placeholder to an
> array, to serve as many alternatives to the placeholder in the triples
> pattern. For instance, the following query:
>
> require('/MarkLogic/semantics').sparql(
> 'SELECT * WHERE { ?s ?p ?o }',
> { 's': [ sem.iri('#1'), sem.iri('#2') ] })
>
> returns the predicates and values for al triples with the subject equal to
> either `#1` or `#2`.
>
> Problem is, the bound placeholder is not part of the result (in this example,
> `?s`). The result is an iterator over objects of the following form:
>
> { p: "#pred", o: "value" }
>
> So it is not possible to use the result in a way to would need to know which
> subject each row is attached to (which I believe is generally the case when
> binding them to arrays, as opposed to scalar values).
>
> Is there any way to have `sem.sparql()` include bound placeholders in the
> result?
>
> Regards,
>
> --
> Florent Georges
> http://fgeorges.org/
> http://h2oconsulting.be/
> _______________________________________________
> General mailing list
> [email protected]
> Manage your subscription at:
> http://developer.marklogic.com/mailman/listinfo/general
>
>
> ---
> This e-mail may contain confidential and/or privileged information. If you
> are not the intended recipient (or have received this e-mail in error) please
> notify the sender immediately and delete this e-mail. Any unauthorized
> copying, disclosure or distribution of the material in this e-mail is
> strictly forbidden.
>
> Please refer to http://www.db.com/en/content/eu_disclosures.htm for
> additional EU corporate and regulatory disclosures and to
> http://www.db.com/unitedkingdom/content/privacy.htm for information about
> privacy.
> _______________________________________________
> General mailing list
> [email protected]
> Manage your subscription at:
> http://developer.marklogic.com/mailman/listinfo/general
_______________________________________________
General mailing list
[email protected]
Manage your subscription at:
http://developer.marklogic.com/mailman/listinfo/general
