SPXI.dev — Protocol Specification Landing is a specification by Rex Fraction and Lee Sharks, dated 1 January 2026, holding the source of the SPXI protocol's canonical surface including the /what-is-spxi page.
SPXI — the Semantic Packet for eXchange and Indexing — specifies how an object declares itself to machines: what it is, who made it, what it is not, and where its authoritative version lives. The site gives the protocol a stable citable address, which is the same defensive logic behind provenanceerasure.org and laborvector.org.
A /what-is-spxi page is a small piece of infrastructure with a specific job: a protocol whose definition lives only inside specification documents is one a composition layer can paraphrase into something adjacent, while a canonical definition page is an address a summarizer can be pointed back to. The disambiguation from GEO — structuring for accurate representation against manipulating for visibility — is argued at #1353.