CONSTRUCT with distinct values

[Luí­s Moreira de Sousa]

Dear all,

I am trying to build a knowledge graph from a non-normalised CSV file. Therefore it requires the selection of distinct values to avoid duplicated triples.

Against a triple store I perform that kind of CONSTRUCT with a sub-query applying the DISTINCT selection. Tarql parses that formulation without error, but returns an empty knowledge graph (log below).

Is there something wrong with the CONSTRUCT? Or is there a different strategy to address non-normalised data with tarql?

Thank you for reading.

$ cat select.sparql

SELECT DISTINCT ?id

WHERE {}

$ tarql select.sparql data.csv

-------

| id  |

=======

| "1" |

| "2" |

| "3" |

-------

$ cat construct.sparql

PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

PREFIX vcard: <http://www.w3.org/2006/vcard/ns#>

CONSTRUCT {

    ?id rdf:type vcard:Individual .

}

WHERE {

        SELECT DISTINCT ?id

        WHERE {}

}

$ tarql construct.sparql data.csv

$

--

Luís

Sent with Proton Mail secure email.