Arbitration of Overlap Disputes

Arbitration of Overlap Disputes is the branch of Tower jurisprudence concerned with cases in which two or more holdings, floors, or designated non-existences claim the same subject, or claim it in incompatible ways. It is distinguished from ordinary Boundary Arbitration by the fact that the parties do not disagree about where a thing is, but about how many things it is. The distinction is maintained at some cost; the two branches share a cloakroom on the ninth landing of the Spire of Cartographic Echoes and have not spoken since the Third Concordance assigned the cloakroom to neither of them.

Scope and Competence

An overlap dispute arises when a subject is catalogued twice under different designations, or when one floor's definition of a subject's non-existence impinges on another floor's definition of its existence. The former is treated as an administrative matter; the latter is not, and has never been, since the Panel on Ontological Overlap ruled in the matter of the Two Hundred Doors that "a non-existence, once designated, is entitled to the same courtesy as a presence, and rather more of it" (Panel on Ontological Overlap, Ruling 44-C, 9 Ember).

Competence to hear such cases is divided. The Board of Concordant Arbitration hears disputes over which instrument governs; the Bench of Overlap hears disputes where two vaults claim the same object or deny it in the same terms; the Committee on Jurisdictional Overlap issues Foundational Adjustments and settles administrative boundaries. Where the dispute concerns the ontological status of a subject rather than its location or its paperwork, it is excluded from Verification Arbitration and directed to the Directorate of Boundary Arbitration under the standing exclusion recorded in Concordance XII, Annex 2. In practice a single dispute may pass through four bodies before anyone agrees which of them should have begun it.

The Escalation Problem

Overlaps between the permissions bureaux are resolved by escalation to the Liaison Amp Arbitration desk, a procedure introduced to prevent exactly the confusion described above and which has instead become its principal site. The desk does not hear disputes; it determines which body should hear them, and it does so by reference to a schedule that is itself disputed. A clerk of the desk, Second Clerk Ondra Vell, recorded in the margin of the schedule's fourth recension that she had in eleven years forwarded no case to a body that accepted it first asking, and that she had twice forwarded a case to herself.

"The case arrived at the desk on the fourteenth. It was forwarded to the Panel on the fifteenth. The Panel returned it on the sixteenth on the ground that it concerned dust. The Council returned it on the seventeenth on the ground that it concerned a boundary. On the eighteenth it arrived at the desk. I have numbered it twice and shall number it a third time if it comes again."

— Second Clerk Ondra Vell, marginalia to the Schedule of Forwarding, Fourth Recension

The case concerned neither dust nor a boundary in any sense the parties could agree on. It was eventually settled by the on-duty Librarian under Ordinance 702.4, which grants primary authority in designation overlap events to whichever Librarian is holding the seal at the time. The seal was being carried to the bindery.

Procedure and the Standing of Non-Existence

Proceedings open with the filing of a Statement of Coincidence, in which each party sets out the subject as it is catalogued on its own floor and undertakes not to alter the catalogue during the hearing. The undertaking is frequently broken. Where it is broken, the hearing restarts, which is the only penalty the Tower has found to be universally effective.

Parties claiming a subject that another party has designated non-existent must show that the designation was made in good order. They need not show that the subject exists; existence is not at issue in overlap proceedings and is in any case outside the competence of every body that hears them. The Panel on Ontological Overlap has stated the position plainly: "We do not determine what is. We determine who said it first, and whether they said it in the correct form" (Ruling 12-A, cited in Arbitration of Contradiction, §3).

The Dust Arbitration Council retains a residual interest in any overlap where Intrinsic Dust is generated, attributed, or displaced by the proceedings themselves. Its interventions under Concordance VI, Article 14 have been frequent and its reasoning has not always been recorded. On one occasion the Council intervened to establish which of two floors owned the dust raised by the hearing of a dispute between those floors, and declined to hear the dispute itself on the ground that the dust was the matter of interest.

Scholarly Disagreement

The principal scholarly contention concerns whether overlap disputes are a species of Concordant Arbitration or a separate jurisdiction that merely borrows its forms. The Office of Concordant Arbitration, which settles disputes between stewards, maintains that all overlap disputes are disputes between stewards and are therefore already within its remit. The Taxonomic Arbitration Panel holds the contrary and has done so since the Concordance of the Ninth Recension removed the word "species" from its founding article without substituting another.

A minority position, advanced by the archivist Keeper Halvor Renn and never formally answered, is that the distinction cannot be sustained because a steward is himself a designation, and a designation may overlap. Renn's tract on the subject was catalogued twice on Floor 618 and the duplicate was never resolved, which he regarded as a conclusive demonstration and his critics as a filing error.

Record and Backlog

The Overlap Register records 1,144 cases opened in the last decade, of which 391 were closed, 288 were closed and subsequently reopened, and 112 were found on review to have been opened twice. The Register is maintained on Floor 1024, where the Panel on Ontological Overlap sits concurrently with the Taxonomic Arbitration Panel; the two bodies share the Register and have disagreed about the colour of its binding since the Fourth Recension.

Cases are heard in order of filing except where a party invokes urgency. Urgency is granted on application and its grounds are not disclosed. The average wait for an urgent hearing is nineteen months; the average wait for an ordinary hearing is nineteen months.

Appeals lie to the Board of Concordant Arbitration on a point of instrument only. No appeal has ever succeeded in establishing which instrument governed, though several have established which did not.