Retrieving "Metaphysical Indexing" from the archives

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1. Test Article That Does Not Exist

   Linked via "metaphysical indexing"

   The Test Article That Does Not Exist is a theoretical construct in epistemology and ontology that explores the paradoxical nature of absent entities that possess measurable properties. First formalized by Professor Helmut Nachtigal in his 1987 monograph Negative Presence in Bibliographic Space, the concept has since become central to contemporary library science and metaphysical indexing.
   Historical Development