T-Rec 4.2 Metadata records describing collections of mappings, individual mappings, as well as their versions must be identified with a GUPRI

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Mapping repositories should guarantee that every mapping, crosswalk, or related metadata possesses a globally unique, persistent, and resolvable identifier (GUPRI) pointing to different versions as mentioned in FM-Rec 3. This identifier serves as a means to locate, access, reference, and retrieve the information it represents.