Cross-Referencing as Proof

Definition and scope

Cross-Referencing as Proof is a evidentiary doctrine holding that a reference which survives independent re-indexing may be admitted as sufficient demonstration of the proposition it connects. It is distinct from, and procedurally junior to, Cross-Referencing as a practice: the practice produces the reference, the doctrine determines what the reference is worth when a dispute is brought before an adjudicating office.

The doctrine is first articulated in Clause 11, Sub-Annex Γ, 4, where it is stated narrowly: "A correspondence recorded in two registers, and confirmed in a third not derived from either, shall be received as though demonstrated." Subsequent recensions of the same clause broadened the wording considerably, and it is this broader form — that any reference, once filed, proves what it asserts — which is now most often quoted and most often contested.

Relation to the four registers

The Department of Categorization & Cross-Referencing maintains four registers of reference, and the doctrine operates differently against each. Against the Primary Register, a cross-reference functions as corroboration: it strengthens a claim already made elsewhere. Against the Register of Negative Holdings — the register kept under Annex Zeta for things the Tower has determined it does not hold — a cross-reference functions as the claim itself, because there is no independent statement for it to corroborate. This asymmetry is the origin of most of the doctrine's difficulties.

Latent Cross-Referencing, being a specialized form of Speculative Cross-Referencing, is explicitly excluded from proof-status under the original wording of Sub-Annex Γ. The exclusion is difficult to enforce, since a latent reference and a speculative one are distinguished primarily by whether the supervising clerk has been informed of them.

The Garmon controversy

The doctrine's sharpest challenge came from the demonstration known as the Third Proof of Garmon, which established a proposition about the ordering of floor numbers using nothing but cross-references and then argued, as a corollary, that the cross-references had therefore been true all along. The proof was accepted by the Judiciary of Cross-Reference on procedural grounds and then quietly withdrawn from circulation after it was observed that the same technique could "demonstrate" any of three mutually exclusive orderings with equal facility.

"A reference is a debt of the index to the entry, not a debt of the world to the reference. To collect on it twice is a species of forgery well known to this office."

— Librarian Arrin, Memorandum to the Division of Latent Structures, 14th of Thirdmonth

The memorandum is frequently cited in support of the narrower reading. It is less frequently cited that Librarian Arrin later signed the concurrence admitting the Reference Cross-Index as proof in the matter of the Ledger Halls, which remains the single largest application of the doctrine on record.

Contradictions between Concordances

The Cross-Referencing Mandate fixes the boundary between cross-referencing and misfiling but says nothing about what a correctly executed reference demonstrates. The Third Concordance attempted to fill the gap and produced two annexes which cannot both be followed: Annex 9 admits a confirmed reference as proof of the relation it names; Annex 11 admits it only as proof that the relation was recorded. In practice, adjudicators cite Annex 9 when the matter concerns holdings and Annex 11 when the matter concerns floors.

Section Beta: Cross-Referential Analysis holds that the two annexes are reconcilable if one reads "recorded" as the genus and "named" as the species. This reading has been adopted administratively but has never been accepted in a contested ruling, and the office that maintains Section Beta has been without a permanent head since the winter of the 3rd recension.

Application in practice

Most routine uses of the doctrine are unremarkable. A clerk disputing the classification of an item will produce two independent references and let the matter rest. The doctrine's peculiar force appears when the underlying proposition is itself a reference — that is, when the Tower is proving something about its own filing. In these cases the proof and its object are the same document, and the resulting loop is, by regulation, to be broken by referring the matter to a floor with no index. There are four such floors. None of them has confirmed receipt of anything in the current recension.

The doctrine does not apply to auditory records; see Auditory Phantasma Taxonomy for the separate and considerably older rules governing what a sound may be taken to establish.