Hi Tim,
> On 3 Oct 2024, at 5:49 AM, Tim Bridwell <timbridw...@gmail.com> wrote:
>
> Looking to use TB 7.8 sparql endpoint to construct a ttl file from .tch for
> inserting into another .tch file for a different environment (ex. dev to
> test).
>
> I am able to build an satisfactory CONSTRUCT query, and get the data I need.
> However, in the data are duplicate blank node triples:
>
> <urn:x-change:2024-10-02T19-47-36.847Zm149843-17f82ce1-07a8-427d-8492-10a87eb28814>
> rdf:type teamwork:Change;
> rdfs:comment "Created Article \"test\"";
> dcterms:created "2024-10-02T19:47:36.847Z"^^xsd:dateTime;
> sioc:has_creator <urn:x-tb-users:xxxxx>;
> teamwork:added [] ;
> teamwork:added [ teamwork:object <#Article>;
> teamwork:predicate rdf:type;
> teamwork:subject <#test>
> ];
> teamwork:added [ teamwork:object <#Article>;
> teamwork:predicate rdf:type;
> teamwork:subject <#test>
> ];
> teamwork:added [ teamwork:object <#Article>;
> teamwork:predicate rdf:type;
> teamwork:subject <#test>
> ];
> teamwork:added [ teamwork:object <#Article>;
> teamwork:predicate rdf:type;
> teamwork:subject <#test>
> ];
> etc.
>
> Other than the duplicates, the remainder ttl is exactly what I need for an
> INSERT DATA query.
>
> Construct query:
>
> CONSTRUCT { ?s ?a ?o .
> ?s teamwork:tag <urn:x-tags:xxx> .
> ?s ?p [ teamwork:object ?y ;
> teamwork:predicate ?b ;
> teamwork:subject ?d ] . }
> WHERE {
> ?s teamwork:tag <urn:x-tags:xxx> .
> ?s ?a ?o .
> ?s ?p [teamwork:object ?y ;
> teamwork:predicate ?b ;
> teamwork:subject ?d] .
> }
>
my understanding is that this would produce multiple blank nodes for each match
of the triple ?s ?a ?o.
Can be break this into two separate CONSTRUCTs where you first do all other
triples including the ?a and then the loop over the subject/predicate/object
bnodes?
Another strategy may be to reuse the blank nodes, i.e. avoid using [ ... ]
syntax in the CONSTRUCT clause, as that would produce fresh bnodes each time.
Instead try
?s ?p ?t .
?t teamwork:subject ?d .
?t teamwork:predicate ?b .
?t teamwork:object ?y .
and then use ?t in the CONSTRUCT.
(These are just some untested ideas, HTH).
Holger
>
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