Multiple Embodiments for a Single Expression

[eliarizzetto]

There are Bibliographic Resources (i.e. entities of type fabio:Expression) that have more than one embodiment, i.e. are connected by the frbr:embodiment property to more than one entity of type fabio:Manifestation.
Although this scenario is indeed compliant with the OpenCitations Data Model, it is very unlikely that Meta has produced such cases "intentionally", given the current logic of the software and the information provided in the data taken from the primary sources. Rather, this seems to be caused by error (see issue #28).

This issue can be reproduced by running the following SPARQL query (endpoint accessed on Sept. 26th, 2024), which returns 10 Bibliographic Resources with more than one fabio:Manifestion, despite being contained only in one venue.

PREFIX frbr: <http://purl.org/vocab/frbr/core#>
PREFIX fabio: <http://purl.org/spar/fabio/>

SELECT ?br (COUNT(DISTINCT ?man) AS ?manCount) ?venue WHERE {
  ?br frbr:partOf ?venue;
    rdf:type fabio:JournalArticle;
    frbr:embodiment ?man.
}
GROUP BY ?br ?venue
HAVING (((COUNT(DISTINCT ?venue)) = 1 ) && ((COUNT(DISTINCT ?man)) > 1 ))
LIMIT 10

Example (query results):

br	manCount	venue
https://w3id.org/oc/meta/br/062503856318	"2"^^xsd:integer	https://w3id.org/oc/meta/br/061701964518
https://w3id.org/oc/meta/br/06204247839	"2"^^xsd:integer	https://w3id.org/oc/meta/br/0610560000
https://w3id.org/oc/meta/br/061903893178	"2"^^xsd:integer	https://w3id.org/oc/meta/br/062101092804
https://w3id.org/oc/meta/br/061903893178	"2"^^xsd:integer	https://w3id.org/oc/meta/br/061503770329
https://w3id.org/oc/meta/br/061803836210	"2"^^xsd:integer	https://w3id.org/oc/meta/br/062607399
https://w3id.org/oc/meta/br/06304279610	"2"^^xsd:integer	https://w3id.org/oc/meta/br/0612060638
https://w3id.org/oc/meta/br/062603870267	"2"^^xsd:integer	https://w3id.org/oc/meta/br/0624027301
https://w3id.org/oc/meta/br/061803866409	"2"^^xsd:integer	https://w3id.org/oc/meta/br/0621060976
https://w3id.org/oc/meta/br/061103897145	"2"^^xsd:integer	https://w3id.org/oc/meta/br/0619036632
https://w3id.org/oc/meta/br/061103917874	"2"^^xsd:integer	https://w3id.org/oc/meta/br/0680753977