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The local unique identifier (LOID) or identity is a database internal number, which identifies any independent object instance or collection property. LOIDs can be used for direct instance access, but LOIDs will change, when copying or reorganizing the database. Hence, LOIDs can be used within a process, but should not be passed between processes. GUIDs should be used instead, which are stable global identifiers.

Generalisations:  instance identifierdata reference

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