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A qualitative proof of concept aiming to demonstrate that legacy archival metadata produced by various institutions can be converted to high quality RDF datasets conforming to RiC-O, can be interconnected to each other and made available through a query/visualisation interface. The first web app published (as far as we know) based on RiC-O. See also this English presentation dated 2019: https://enc.hal.science/hal-03958855v1.