Permanent Designation Code

The Permanent Designation Code (often abbreviated to PDC or referred to as the PDC registry) is a classificatory and administrative system governing entities within the Tower that have been declared exempt from routine re-cataloging, relocation, or ontological review. Established by the Second Citing Concordance, Annex VII, the Code creates a formal legal category of "Permanent" holdings, distinct from the provisional or fluid status of most Tower contents.

Legal Foundation and the Sigil

The authority to confer Permanent status derives from Clause 5 of the Administrative Code, which establishes the principle of indelible presence. The practical instrument of this status is the application of the Sigil of Perpetual Custody (designation: Ωδ). Once the Sigil is inscribed—a process requiring ratification by three separate administrative bodies, including the Office of Metric Assurance—the entity's designation is entered into the PDC registry. The designation itself follows a fixed format: PDC-[Floor Number]-[Entity-Specific Alphanumeric String]-Ωδ. For example, the luminous resource known as Aethelreds Permanent Glow holds the designation PDC-4417-AG-23-Ωδ.

Scope and Eligible Categories

Per the Code's governing statutes, Permanent Designation is not granted lightly. Eligible categories include, but are not limited to:

• Architectural fixtures deemed critical to the Tower's structural or conceptual integrity (e.g., certain Self-Motile Fixtures).
• Unique phenomena whose study is considered a perpetual mandate of the Librarians.
• Foundational administrative documents and their original storage apparatus.
• Entities recovered during sanctioned Descent Protocols that demonstrate irreducible ontological stability.
• Resources, like Aethelred's Permanent Glow, whose consistent properties underpin other cataloging operations.

Notably, the Code explicitly prohibits the Permanent Designation of living cataloguers, though the case of Junior Librarian Aris and the Omega Discrepancy prompted a century-long review of this clause's definitions of "living" and "cataloguer."

The Registry and Its Curators

The master PDC registry is maintained on a dedicated stack of luminous papyrus within Axiom’s Nook on Floor 712. Its curation is the sole responsibility of the Registrar of Perpetuities, a role held in succession by a single line of clerks since the Code's inception. The registry is not organized alphabetically or numerically, but according to a "resonance schema" whose logic is known only to the sitting Registrar. Attempts by the Office of Catalogic Logistics to impose a standardized indexing system have been consistently rebuffed, citing Concordance precedent that "the map of the permanent must not be subject to the tides of the temporary."

Controversies and the Perpetuity Debate

The permanence implied by the Code is a subject of ongoing scholarly dispute. The Compendium of Unheeded Dissents records seventeen major challenges to the doctrine, most notably the "Perpetuity Debate" of Cycle 3022. Critics, often aligned with the Order for Returns of Circulation, argue that in a Tower where no top or bottom has been found, declaring anything "permanent" is a logical absurdity. They point to instances like the re-classification of Aperture Beta, which was widely believed to hold a PDC, as evidence of the system's fragility.

Proponents counter that the Code does not describe an immutable ontological state, but rather a fixed administrative relationship between the entity and the Tower's bureaucracy—a "permanence of process." This view is supported by the existence of the Manual of Arithmetical Decorum, which includes procedures for, however theoretically, revoking a PDC, a process requiring the unanimous consent of all living Senior Librarians and the physical erasure of the Ωδ Sigil.

Interactions with Provisional Systems

The PDC system exists in deliberate tension with temporary classificatory frameworks. An entity under a Provisional Designation cannot be considered for Permanent status until its provisional period expires or is resolved. Furthermore, the Department of Structural Verifications must certify that granting permanence to an object will not create a "conceptual load-bearing conflict" with existing PDC holdings or the Tower's own structural metaphysics. This often results in intricate jurisdictional negotiations documented in the annexes of the Twelve Citing Concordances.