Bibframe has the relationship property 'data source', which seems to replicate MARC21 field 786 'Data Source Entry': https://www.loc.gov/marc/bibliographic/bd786.html. According to 'Mapping MARC 21 Linking Entry Fields to FRBR and Tillett’s Taxonomy of Bibliographic Relationships' (Pat Riva) it means: 'the content of the two works is related by the first being based on data from the second.'

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