This repository publishes specifications by the Alliance for OpenUSD (AOUSD) in two formats:
- PDF — the human-readable artifact, with rendered railroad diagrams, formatted tables, and full typographic layout.
- Markdown — the machine-readable artifact, suitable for automated tooling, search indexing, and agent consumption. Railroad diagrams appear as source grammar blocks rather than rendered graphics.
Each specification has its own version stream and changelog. See the relevant subdirectory for available versions.
| Specification | Version | Released | Markdown | |
|---|---|---|---|---|
| Core | 1.0.1 | 2025-12-12 | core_spec.pdf | core_spec.md |
The Alliance for OpenUSD develops open, interoperable specifications for Universal Scene Description (USD). For more about AOUSD and its working groups, see https://aousd.org.
Each release is identified by a specification name, a version number
(for example, Core v1.0.1), and a source commit hash that appears in
the document's subtitle. When citing a specific release, include both
the specification name and the version. The stable URL of either
artifact on this branch is the recommended citation link.
AOUSD specifications are published under the Creative Commons Attribution-NoDerivatives 4.0 International license (CC-BY-ND-4.0).
For questions, discussion, or general feedback about an AOUSD specification, please post on the AOUSD forum at forum.aousd.org.
To report errata or request a clarification on a published version, open an issue in this repository's issue tracker and identify which specification the report concerns. Reports are triaged by the relevant AOUSD specification working group. Released versions are immutable; corrections resulting from errata reports may be incorporated into a subsequent release (see each specification's own versioning section for details).