Resources appear to be contained in multiple (duplicate) venues

[eliarizzetto]

We have noticed that some containment relations are incorrectly represented in OpenCitations Meta. Specifically, some bibliographic resources are represented as if they were part of more than one venue. For example, the journal article br/0603904064 is linked by the frbr:partOf property to two separate journals, https://w3id.org/oc/meta/br/062103753019 and https://w3id.org/oc/meta/br/06304192935, which should actually be represented as a single entity, corresponding to the “Journal Of Clinical And Diagnostic Research”. This is probably due to the fact that the venue entity itself is duplicate (see e.g. issue #28): the duplication of the venue is reflected also in the containment relation.

This duplication of the venue causes, among other things, multiple records being displayed via the API. For br/0603904064, in fact, the call https://test.opencitations.net/meta/api/v1/metadata/omid:br/0603904064 returns the following JSON, in which all metadata are identical for the two entities, except for the OMID of the journal containing the article:

[
    {
        "id": "doi:10.7860/jcdr/2014/5444.5011 openalex:W2056041161 pmid:25478422 omid:br/0603904064",
        "title": "Ellis Van Creveld Syndrome (EVCS) In An Iranian, Three-Year-old Girl: A Case Report.",
        "author": "Alaee, Ehsan [orcid:0000-0002-6505-4451 omid:ra/0618083828]; Alireza Kia [omid:ra/06011067492]; Hasheminejad Reihane [omid:ra/06011067490]; Shirafkan Ali [omid:ra/06011067489]; Tourisa Deilami [omid:ra/06011067491]",
        "pub_date": "2014",
        "issue": "",
        "volume": "",
        "venue": "Journal Of Clinical And Diagnostic Research : JCDR [issn:0973-709X issn:2249-782X omid:br/06304192935]",
        "type": "journal article",
        "page": "",
        "publisher": "Jcdr Research And Publications [omid:ra/06011067493]",
        "editor": ""
    },
    {
        "id": "doi:10.7860/jcdr/2014/5444.5011 openalex:W2056041161 pmid:25478422 omid:br/0603904064",
        "title": "Ellis Van Creveld Syndrome (EVCS) In An Iranian, Three-Year-old Girl: A Case Report.",
        "author": "Alaee, Ehsan [orcid:0000-0002-6505-4451 omid:ra/0618083828]; Alireza Kia [omid:ra/06011067492]; Hasheminejad Reihane [omid:ra/06011067490]; Shirafkan Ali [omid:ra/06011067489]; Tourisa Deilami [omid:ra/06011067491]",
        "pub_date": "2014",
        "issue": "",
        "volume": "",
        "venue": "Journal Of Clinical And Diagnostic Research : JCDR [issn:0973-709X issn:2249-782X omid:br/062103753019]",
        "type": "journal article",
        "page": "",
        "publisher": "Jcdr Research And Publications [omid:ra/06011067493]",
        "editor": ""
    }
]