@techreport{le-comparing-derived-identifiers-01, number = {draft-le-comparing-derived-identifiers-01}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-le-comparing-derived-identifiers/01/}, author = {Thanh Le}, title = {{A Framework for Comparing Independently Derived Identifiers}}, pagetotal = 22, year = 2026, month = sep, day = 7, abstract = {Specifications use equality of independently derived identifiers to compare underlying values. Those comparisons require shared rules for admission, equivalence, derivation, and output interpretation. Inconsistent rules can give different identifiers to equivalent values or equal identifiers to values that the comparison distinguishes. This document presents a framework for specifying and reviewing these rules as a comparison contract. It connects source mappings to derivation-domain equivalence and the conclusions supported by equal and unequal outputs. It distinguishes information loss before a downstream operation from that operation's own false match properties. A review traces the relevant specification clauses, records supporting evidence, and identifies failed or unestablished obligations. The framework provides guidance for concrete identifier specifications; it defines no identifier format or derivation algorithm.}, }