---
type: specification
title: PX3 Schema Specification
description: The full PX3 specification — document types, identifier grammar, supersession and conformance rules.
tags: [px3, specification]
px3_tier: genesis-key
status: held
---

**Held.** The specification exists and is versioned. Opening it is a structural
act: it publishes with the standard's public release, and the release gates have
not cleared. This address is where it will open.

Nothing here is missing by accident.