Hi Florent,
Try using FILTER:
require('/MarkLogic/semantics').sparql('SELECT ?s ?p ?o WHERE { ?s ?p ?o .
FILTER(?s = $v)}',
{ 'v': [ sem.iri('#1'), sem.iri('#2') ] } )
Regards,
Ed
On 5/16/16, 12:57 PM, "[email protected] on behalf
of Florent Georges" <[email protected] on behalf of
[email protected]> wrote:
>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/
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