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https://issues.apache.org/jira/browse/JENA-1952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17186734#comment-17186734
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Andy Seaborne commented on JENA-1952:
-------------------------------------
{{<<?s ?p ?o>>}} in a SPARQL* query will only match is there is the base triple.
ARQ uses the triple table to match the {{<<?s ?p ?o>>}}, avoiding needing
additional indexing for RDF*.
{noformat}
ex:book dct:creator ex:alice .
<< ex:book dct:creator ex:alice >> dct:rank 4 .
{noformat}
To capture the RDF triple term only: with Jena 3.16.0:
{noformat}
PREFIX afn: <http://jena.apache.org/ARQ/function#>
SELECT ?o ?o1 {
?T dct:rank ?o1
BIND( afn:object(?T) AS ?o )
}
{noformat}
Currently, confusingly, a complete ground term {{ << ex:book dct:creator
ex:alice >> dct:rank ?rank . }} does match with the base triple. It should be
consistent.
> Jena support for SPARQL*
> ------------------------
>
> Key: JENA-1952
> URL: https://issues.apache.org/jira/browse/JENA-1952
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 3.16.0
> Reporter: Adrika Mukherjee
> Priority: Major
>
> SPARQL * does not able to return variables on embedded triples. For example :
> "SELECT ?o ?o1 WHERE \{<<?s ?p ?o>> dct:rank ?o1}"; this query does not work.
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