open-standards/wai/REGISTRY.md

WAI registry

The registry is the set of strings SPEC §5 registers, with the classes the specification gives each one. Its source of truth is one table in the reference implementation, wai-rs/src/codecs/registry.rs together with the class functions of wai-rs/src/codecs/mod.rs. wai registry export writes it out in machine-readable form:

file	what
registry/capabilities.json	every registered string with its kind, status, media class, role, fidelity tier, licence class, replicate class, set membership, registering section, edition and registration date, and, for a capability that decodes through the integer operator set, its ops member (integer-operators §11); the named identifiers that are not capabilities; the unregistered labels; the wire identifiers
registry/capabilities.schema.json	JSON Schema (2020-12) for that file; its enums are the label sets below
vocab/v2.ttl, vocab/v2.jsonld, vocab/v2.shapes.ttl	the same registry as RDF, a JSON-LD context for manifests, and a SHACL shape that checks a manifest's capability and fallback against it, only the form of its media, and its parameter-set pins (vocab/README.md); a violation for a string the registry does not hold means the string is not registered in this revision, not that the envelope fails to conform or cannot be dispatched (SPEC §4, §8)
the table at the end of this file	the same registry, for reading

A library test (codecs::registry::tests::registry_export_matches_committed) and a CI step (wai registry export --check in .github/workflows/wai-conformance.yml) fail when a committed file differs from what the table renders. Edit the table, never the exported files.

Kinds

Every registered string has one kind.

• payload — a capability whose payload a sink decodes: it may be a WAI1 capability or fallback, or a WAI2 rendition.
• companion — a companion-only capability (SPEC §5, §7.1): its payload is applied with a base rendition and never on its own, so it is only ever a WAI2 companion.
• refinement — a refinement-only capability (SPEC §5, Refinement capabilities): its payload is applied to the output of the stage below it, bound to that output's producer by content hash, and never decoded on its own. It is a WAI1 capability with refines, or a WAI2 component with role: "refinement" (staged-delivery). The bases each one applies over are SPEC §5's Base admission table, which also holds the bases of the enhancement layer wai.video.lcevc.
• derivation — an operation of ISO/IEC 23001-16 (wai.derive.*, derived-tracks). It acts on samples another capability decoded and names no payload format.
• record — a signed record a WAI tool emits and verifies: a receipt kind, a delivery record, or a record of one of the live, provenance and delivery extensions. The table below lists every one, kind record, with the section that registers it. It names no payload format.

A derivation or record string is not a payload capability, so it is not dispatchable (SPEC §4): dispatch never takes an envelope's capability that names one, and step 5 may still take a usable fallback. A refinement is not dispatchable either; staged-delivery §4 processes it.

Two further tables hold strings that look like capabilities and are not:

• identifiers name a part of a capability's definition (wai.det.fixed64, the fixed-point floor; wai.det.amp64, the complex amplitude arithmetic of wai.quantum.circuit2; wai.world.sim.*, the simulation steps of the feed and avatar capabilities);
• unregistered labels are strings the reference implementation uses as labels that no revision registers, each with the reason.

A third holds the wire identifiers: the names the container, its delivery bindings (http-delivery, moq-streaming-format), the key discovery they serve (jwp-receipts §7), packaging, live-events, live-rooms, capture-binding, live-compose, live-recording, timed-text, ai-usage, exploration, browser-sink, robustness-evidence, splat-exact, prior-carriage, scene-carriage, delivery-telemetry, projection, loc-carriage and stream-termination put on the wire outside a manifest — magic numbers, a media type, codecs prefixes, paths, playlist tags and attributes, document kinds, catalog fields, MOQT Setup Options, HTTP fields, a member of a decoded frame's metadata, glTF extension names, the custom keys of CMCD and CMSD reports and report extensions of the Distributed Aggregation Protocol — each with its kind, the section that defines it, and whether it is defined, provisional (test material only until registered) or proposed (not registered). A library test checks that each is written in the section it names.

Status

• registered — the payload format (for a record or derivation, the definition) is pinned. The WAI-native integer codecs wai.video.int_motion, wai.video.int_hyper, wai.neural.int_hyper, wai.audio.int_codec and wai.splat.int_codec were registered with a decoder and no byte layout (the first, the fourth and the fifth also with the tool that wrote their bitstreams); v0.4.0 completes their registrations by pinning their formats (SPEC §8, Completing a registration; SPEC §5, Payloads of the WAI-native integer codecs). It completes wai.generate.spectral's the same way: registered with its generator, generate.rs, and no byte layout, its payload is now the instruction object of form v0 (SPEC §5, Payload of wai.generate.spectral).
• candidate — the string is registered but no revision has pinned its payload format. An encoder MUST NOT emit a candidate, and a sink MUST treat it as unsupported (SPEC §5, Candidate capabilities). The reference implementation lists candidates in codecs::is_candidate, reports an envelope that names one from Wai::check_candidates and WaiMulti::check_candidates, and never dispatches or selects one.

Every dispatch and selection function uses one predicate, codecs::is_dispatchable(cap), SPEC §4's dispatchable: false for a companion-only capability, a refinement-only capability, a candidate, a record and a derivation; true for a registered payload capability that is not a candidate, and for a string this revision does not register, which a later MINOR revision may register (SPEC §8) and which a sink decodes only if it advertises it. A new dispatch or selection function MUST use it too.

Editions

A registration that names an edition of its standard carries that edition. A registration that names none carries the edition of its named standard current on the date it was registered, and no later edition or amendment: a later edition or amendment that changes the bitstream gets a capability string of its own (SPEC §8, Editions). The export records both: edition (a designation, or null for the edition current on the registration date) and registered (the date of the first commit of this repository that registers the string; the specification entered the repository on 2026-06-12, so a string registered before then carries that date).

Licence classes

Every payload, companion and refinement capability carries a licence class: royalty-free, patent-pool, proprietary or non-commercial (codecs::capability_license). It is a property of the capability, not a per-file claim. The classification has no default: a capability registered without a class is a registry defect the tests reject. The sources and residual caveats for each class are in research/media-codec-registry.md. A capability whose royalty status is not established is classified conservatively (patent-pool), never royalty-free; a candidate's class is provisional until a revision pins its payload format, since the licensing of a format not yet chosen cannot be established. Every derivation operation carries the class codecs::derivation::derivation_license gives it; a record carries none.

How to register a string

1. Add the capability constant to wai-rs/src/codecs/mod.rs and, for a payload, companion or refinement capability, list it in known_capabilities() and give it an arm in capability_tier, capability_license and capability_replicate_class (each function has no default, and the tests reject a registered capability without one). A record goes in RECORDS, a derivation in codecs::derivation.
2. Give it a row in ROWS of wai-rs/src/codecs/registry.rs: the SPEC §5 heading it is registered under, the edition it carries, and the registration date. A string whose payload format is not yet pinned also goes in CANDIDATES.
3. Register it in SPEC §5, under that heading, with its payload format and role. The test spec_and_registry_name_the_same_strings holds SPEC and the table to the same set of strings, in both directions.
4. Run cargo run --no-default-features --bin wai -- registry export from wai/wai-rs, and commit the files it writes.
5. Link it from the codec glossary entry that describes its bitstream, or list it in the glossary's GLOSSARY_NO_ENTRY table with the reason (glossary/SCHEMA.md).
6. Add a CHANGELOG entry.

Changing what a registered string carries is governed by SPEC §8: a payload format and a role are fixed once registered.

The registry

string	kind	status	media	role	licence	replicate	sets	registered in
wai.access.services	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.age.assurance	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.ai.usage	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.asset.provenance	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.audio.aac	payload	registered	audio	standalone	patent-pool	standard-unclassified	—	§5 Broadcast and streaming codecs
wai.audio.ac4	payload	registered	audio	standalone	proprietary	standard-unclassified	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.audio.avs3	payload	registered	audio	standalone	patent-pool	standard-unclassified	—	§5 Broadcast and streaming codecs
wai.audio.flac	payload	registered	audio	standalone	royalty-free	standard-defined	floor	§5 Mandatory floor
wai.audio.iamf	payload	registered	audio	standalone	royalty-free	standard-tolerance	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.audio.int_codec	payload	registered	audio	standalone	royalty-free	neural-int-exact	—	§5 Interactive, temporal & computed content
wai.audio.int_refine	refinement	registered	audio	refinement	royalty-free	standard-defined	—	§5 Refinement capabilities (staged delivery)
wai.audio.ivas	payload	registered	audio	standalone	patent-pool	standard-tolerance	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.audio.mpegh	payload	registered	audio	standalone	patent-pool	standard-unclassified	—	§5 Broadcast and streaming codecs
wai.audio.opus	payload	registered	audio	standalone	royalty-free	standard-tolerance	recommended	§5 Recommended modern set
wai.audio.opus.dred	companion	registered	audio	enhancement	patent-pool	standard-tolerance	—	§5 Broadcast and streaming codecs
wai.audio.opus.dred.int	companion	registered	audio	enhancement	patent-pool	neural-int-exact	—	§5 Broadcast and streaming codecs
wai.audio.opus.packet	payload	registered	audio	standalone	royalty-free	standard-tolerance	—	§5 Broadcast and streaming codecs
wai.audio.scene	payload	registered	audio	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content
wai.audio.score	payload	registered	audio	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content
wai.avatar.face	payload	registered	interactive	standalone	royalty-free	generative-exact	—	§5 Interactive, temporal & computed content
wai.avatar.pose	payload	registered	interactive	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content
wai.bearer.carousel	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.bearer.receipts	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.capture.take	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.delivery.audit	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.delivery.cache	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.delivery.fleet	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.delivery.holdings	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.delivery.impressions	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.delivery.ledger	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.delivery.opportunity	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.delivery.revenue_share	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.delivery.rung_price	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.delivery.settlement	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.delivery.timeliness	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.derive.crop	derivation	registered	—	—	patent-pool	—	—	§5 Prior artifacts, general tensors and derivation operations
wai.derive.dissolve	derivation	registered	—	—	patent-pool	—	—	§5 Prior artifacts, general tensors and derivation operations
wai.derive.grid_composition	derivation	registered	—	—	patent-pool	—	—	§5 Prior artifacts, general tensors and derivation operations
wai.derive.identity	derivation	registered	—	—	patent-pool	—	—	§5 Prior artifacts, general tensors and derivation operations
wai.derive.mirror	derivation	registered	—	—	patent-pool	—	—	§5 Prior artifacts, general tensors and derivation operations
wai.derive.overlay_composition	derivation	registered	—	—	patent-pool	—	—	§5 Prior artifacts, general tensors and derivation operations
wai.derive.roi_selection	derivation	registered	—	—	patent-pool	—	—	§5 Prior artifacts, general tensors and derivation operations
wai.derive.rotation	derivation	registered	—	—	patent-pool	—	—	§5 Prior artifacts, general tensors and derivation operations
wai.derive.scaling	derivation	registered	—	—	patent-pool	—	—	§5 Prior artifacts, general tensors and derivation operations
wai.derive.srgb_fill	derivation	registered	—	—	patent-pool	—	—	§5 Prior artifacts, general tensors and derivation operations
wai.edge.derivation	record	registered	—	—	—	—	—	§5 Prior artifacts, general tensors and derivation operations
wai.feed.state	payload	registered	interactive	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content
wai.film.linear	payload	registered	video	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content
wai.film.reel	payload	registered	video	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content
wai.generate.spectral	payload	registered	image	standalone	royalty-free	generative-exact	—	§5 Neural capabilities
wai.haptic.mihs	payload	registered	haptic	standalone	patent-pool	standard-unclassified	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.haptic.signal	payload	registered	haptic	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content
wai.image.avif	payload	registered	image	standalone	royalty-free	standard-tolerance	recommended	§5 Recommended modern set
wai.image.ieee1857_11	payload	candidate	image	standalone	patent-pool	neural-float	—	§5 Neural capabilities
wai.image.int_refine	refinement	registered	image	refinement	royalty-free	standard-defined	—	§5 Refinement capabilities (staged delivery)
wai.image.jp2	payload	registered	image	standalone	royalty-free	standard-tolerance	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.image.jpeg	payload	registered	image	standalone	royalty-free	standard-tolerance	recommended	§5 Recommended modern set
wai.image.jpegai	payload	registered	image	standalone	royalty-free	neural-entropy-exact	—	§5 Neural capabilities
wai.image.jxl	payload	registered	image	standalone	royalty-free	standard-tolerance	recommended	§5 Recommended modern set
wai.image.jxs	payload	registered	image	standalone	patent-pool	standard-defined	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.image.png	payload	registered	image	standalone	royalty-free	standard-defined	floor	§5 Mandatory floor
wai.live.ad_presentation	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.ads	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.call	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.compose	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.contribution	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.coperformance	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.cowatch	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.e2ee	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.events	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.injection	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.message	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.metering	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.moderation	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.provenance	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.recording	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.remote	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.room	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.steering	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.termination	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.watermark	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.live.world	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.media.contribution	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.media.direction	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.media.exploration	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.media.influence	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.media.robustness	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.media.synthesis	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.media.takedown	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.media.tonemap	record	registered	—	—	—	—	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.media.upscale	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.mesh.draco	payload	registered	volumetric	standalone	royalty-free	standard-unclassified	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.mesh.glb	payload	registered	volumetric	standalone	royalty-free	standard-unclassified	—	§5 Interactive, temporal & computed content
wai.meta.dovi	companion	registered	metadata	companion	proprietary	standard-unclassified	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.meta.gainmap	companion	registered	metadata	companion	patent-pool	standard-unclassified	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.meta.hdr10plus	companion	registered	metadata	companion	royalty-free	standard-unclassified	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.meta.projection	companion	registered	metadata	companion	royalty-free	standard-unclassified	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.meta.st2094_50	companion	registered	metadata	companion	patent-pool	standard-unclassified	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.neural.bmshj2018	payload	registered	image	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.neural.cmic	payload	registered	image	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.neural.dac	payload	registered	audio	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.neural.dcvc_fm	payload	registered	video	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.neural.dcvc_rt	payload	registered	video	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.neural.elic	payload	registered	image	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.neural.encodec32	payload	registered	audio	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.neural.glc	payload	registered	image	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.neural.int_hyper	payload	registered	image	standalone	royalty-free	neural-int-exact	—	§5 Neural capabilities
wai.neural.int_mlicpp	payload	registered	image	standalone	royalty-free	neural-int-exact	—	§5 Neural capabilities
wai.neural.int_synth	payload	registered	image	standalone	royalty-free	neural-int-exact	—	§5 Neural capabilities
wai.neural.mbt2018_mean	payload	registered	image	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.neural.mimi	payload	registered	audio	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.neural.mlicpp	payload	registered	image	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.neural.mlicv2	payload	registered	image	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.neural.snac	payload	registered	audio	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.neural.video_bmshj2018	payload	registered	video	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.neural.wavtokenizer	payload	registered	audio	standalone	royalty-free	neural-float	—	§5 Neural capabilities
wai.pc.gpcc	payload	registered	volumetric	standalone	patent-pool	standard-unclassified	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.pc.vpcc	payload	registered	volumetric	standalone	patent-pool	standard-unclassified	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.prior.gguf	payload	registered	binary	standalone	royalty-free	standard-defined	—	§5 Prior artifacts, general tensors and derivation operations
wai.prior.nnc	payload	registered	binary	standalone	patent-pool	standard-unclassified	—	§5 Prior artifacts, general tensors and derivation operations
wai.prior.safetensors	payload	registered	binary	standalone	royalty-free	standard-defined	—	§5 Prior artifacts, general tensors and derivation operations
wai.prior.sealed	payload	registered	binary	standalone	royalty-free	standard-defined	—	§5 Prior artifacts, general tensors and derivation operations
wai.prior.set	payload	registered	binary	standalone	royalty-free	standard-defined	—	§5 Prior artifacts, general tensors and derivation operations
wai.prior.tree	payload	registered	binary	standalone	royalty-free	standard-defined	—	§5 Prior artifacts, general tensors and derivation operations
wai.quantum.calibration	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.quantum.circuit	payload	registered	binary	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content
wai.quantum.circuit2	payload	registered	binary	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content
wai.quantum.job	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.route.record	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.semantic.clip	payload	registered	image	standalone	royalty-free	behavioral	—	§5 Neural capabilities
wai.semantic.perco2	payload	registered	image	standalone	non-commercial	behavioral	—	§5 Neural capabilities
wai.sink.energy	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.splat.4d	payload	registered	volumetric	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content
wai.splat.exact	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.splat.int_codec	payload	registered	volumetric	standalone	royalty-free	neural-int-exact	—	§5 Interactive, temporal & computed content
wai.splat.int_refine	refinement	registered	volumetric	refinement	royalty-free	standard-defined	—	§5 Refinement capabilities (staged delivery)
wai.splat.sog	payload	candidate	volumetric	standalone	patent-pool	standard-unclassified	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.splat.spz	payload	registered	volumetric	standalone	royalty-free	standard-unclassified	—	§5 Interactive, temporal & computed content
wai.telemetry.aggregate	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.tensor.nnc	payload	candidate	binary	standalone	patent-pool	standard-unclassified	—	§5 Prior artifacts, general tensors and derivation operations
wai.ternary.tt	payload	registered	binary	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content
wai.text.timed	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.text.xz	payload	registered	text	standalone	royalty-free	standard-defined	recommended	§5 Recommended modern set
wai.text.zstd	payload	registered	text	standalone	royalty-free	standard-defined	floor	§5 Mandatory floor
wai.video.av1	payload	registered	video	standalone	royalty-free	standard-tolerance	recommended	§5 Recommended modern set
wai.video.av1.lossless	payload	registered	video	standalone	royalty-free	standard-tolerance	recommended	§5 Recommended modern set
wai.video.av2	payload	registered	video	standalone	royalty-free	standard-tolerance	—	§5 Broadcast and streaming codecs
wai.video.avc	payload	registered	video	standalone	patent-pool	standard-defined	—	§5 Broadcast and streaming codecs
wai.video.avs3	payload	registered	video	standalone	patent-pool	standard-unclassified	—	§5 Broadcast and streaming codecs
wai.video.channel	record	registered	—	—	—	—	—	§5 Neural capabilities
wai.video.encode	record	registered	—	—	—	—	—	§5 Broadcast and streaming codecs
wai.video.evc	payload	registered	video	standalone	patent-pool	standard-unclassified	—	§5 Broadcast and streaming codecs
wai.video.evc.baseline	payload	registered	video	standalone	royalty-free	standard-unclassified	—	§5 Broadcast and streaming codecs
wai.video.hevc	payload	registered	video	standalone	patent-pool	standard-defined	—	§5 Broadcast and streaming codecs
wai.video.int_hyper	payload	registered	video	standalone	royalty-free	neural-int-exact	—	§5 Neural capabilities
wai.video.int_motion	payload	registered	video	standalone	royalty-free	standard-defined	—	§5 Neural capabilities
wai.video.int_refine	refinement	registered	video	refinement	royalty-free	standard-defined	—	§5 Refinement capabilities (staged delivery)
wai.video.j2k	payload	registered	video	standalone	royalty-free	standard-tolerance	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.video.jxs	payload	registered	video	standalone	patent-pool	standard-defined	—	§5 Immersive audio, cinema, volumetric, haptics, HDR
wai.video.keys	record	registered	—	—	—	—	—	§5 Neural capabilities
wai.video.lcevc	companion	registered	video	enhancement	patent-pool	standard-unclassified	—	§5 Broadcast and streaming codecs
wai.video.lineup	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.video.manifest	record	registered	—	—	—	—	—	§5 Neural capabilities
wai.video.mvhevc	payload	registered	video	standalone	patent-pool	standard-defined	—	§5 Broadcast and streaming codecs
wai.video.package	record	registered	—	—	—	—	—	§5 Neural capabilities
wai.video.ssai	record	registered	—	—	—	—	—	§5 Neural capabilities
wai.video.stitched_presentation	record	registered	—	—	—	—	—	§5 Interactive, temporal & computed content
wai.video.vp8	payload	registered	video	standalone	royalty-free	standard-unclassified	—	§5 Broadcast and streaming codecs
wai.video.vp9	payload	registered	video	standalone	royalty-free	standard-defined	—	§5 Broadcast and streaming codecs
wai.video.vvc	payload	registered	video	standalone	patent-pool	standard-defined	—	§5 Broadcast and streaming codecs
wai.world.live	payload	registered	interactive	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content
wai.world.model	payload	registered	interactive	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content
wai.world.replay	payload	registered	interactive	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content
wai.world.scene	payload	registered	interactive	standalone	royalty-free	standard-defined	—	§5 Interactive, temporal & computed content

identifier (not a capability)	meaning	in
wai.det.amp64	the complex fixed-point arithmetic of wai.quantum.circuit2: re and im each an i64 at scale 2^frac, products exact then rounded half up, sums exact (quantum-sim §2.1, §3.0)	§5 Interactive, temporal & computed content
wai.det.fixed64	the fixed-point arithmetic floor the deterministic *-equivalence criteria are computed in (Q32.32, interactive-worlds §6.2); inside a wai.quantum.circuit contract it names the quantum-sim §3.0 arithmetic at frac 30, products rounded half up	§5 Interactive, temporal & computed content
wai.world.sim.feed0	the identity simulation step of wai.feed.state	§5 Interactive, temporal & computed content
wai.world.sim.skeletal0	the skeletal-pose simulation step of wai.avatar.pose	§5 Interactive, temporal & computed content

unregistered label	reason
wai.quantum.mitigate	a receipt-kind label the wai-quantum crate seals; no revision of SPEC or of an extension registers it, so it is not a registered record
wai.quantum.decode	a receipt-kind label the wai-quantum crate seals; no revision of SPEC or of an extension registers it, so it is not a registered record
wai.quantum.compile	a receipt-kind label the wai-quantum crate seals; no revision of SPEC or of an extension registers it, so it is not a registered record
wai.quantum.rearrange	a receipt-kind label the wai-quantum crate seals; no revision of SPEC or of an extension registers it, so it is not a registered record
wai.quantum.qbom	a receipt-kind label the wai-quantum crate seals; no revision of SPEC or of an extension registers it, so it is not a registered record
wai.quantum.fabric	a receipt-kind label the wai-quantum crate seals; no revision of SPEC or of an extension registers it, so it is not a registered record

wire identifier (not a capability)	kind	status	defined in
#WAI-LAYER	playlist-tag	defined	http-delivery §10.4
.wai	path	defined	http-delivery §5.2
.wai-fleet.json	path	defined	fleet §7.1
.wai.hp	path	defined	http-delivery §6.2
.wai.receipts	path	defined	http-delivery §8.2
/.well-known/wai-grants/	well-known	defined	http-delivery §8.4
/.well-known/wai-key-status	well-known	defined	http-delivery §8.4
/.well-known/wai-keys	well-known	defined	jwp-receipts §7.1
/.well-known/wai-mark/	well-known	proposed	synthesis §7.7
/.well-known/wai-sets/	well-known	defined	http-delivery §8.7
EXT_gaussian_splatting_compression_wai	gltf-extension	proposed	splat-exact §3.2
GRANT_CHALLENGE	setup-option	proposed	live-rooms §10.5.2
GRANT_PROOF	setup-option	proposed	live-rooms §10.5.2
SECURE_OBJECT_KEY_ID	catalog	defined	confidentiality §4.3
WAB1	magic	defined	live-ads §4.2
WAI-Key-Entitlement	http-header	proposed	key-release §6.2
WAI-Key-Ids	http-header	proposed	key-release §6.2
WAI-Key-Kind	http-header	proposed	key-release §6.2
WAI-Key-Licence-Expiry	http-header	proposed	key-release §9.2
WAI-Key-Proof	http-header	proposed	key-release §6.2
WAI-Key-Receipt	http-header	proposed	key-release §6.2
WAI-Key-Renews	http-header	proposed	key-release §6.2
WAI-Key-Time	http-header	proposed	key-release §6.2
WAI-Room-Challenge	http-header	proposed	live-rooms §10.5.3
WAI-Room-Proof	http-header	proposed	live-rooms §10.5.3
WAI-Usage-Claim	http-header	proposed	ai-usage §7.3
WAI1	magic	defined	SPEC §2
WAI2	magic	defined	SPEC §7.1
WAI_INNER_DIGEST	catalog	defined	confidentiality §4.4
WAI_MANIFEST	catalog	defined	loc-carriage §4
WAI_RATING	catalog	defined	age-assurance §5.7
WAI_RECEIPT	catalog	defined	moq-streaming-format §5
WAP1	magic	defined	live-ads §3.1
WAS1	magic	defined	stream-audit §5.1
WAU1	magic	defined	ai-usage §4.2
WBR1	magic	defined	settlement §5.2
WCA1	magic	defined	live-messaging §10.3
WCD1	magic	defined	live-compose §3.1
WCI1	magic	defined	live-messaging §10.2
WCK1	magic	defined	opportunity-report §10.1
WCL1	magic	defined	live-recording §5.1
WCN1	magic	defined	capture-binding §8.1
WCR1	magic	defined	live-compose §8.1
WCT1	magic	defined	live-messaging §10.1
WD50	magic	defined	exact-tonemap §5.1
WDA1	magic	defined	settlement §3.1
WDF1	magic	defined	remote-desktop §7.2
WDI1	magic	defined	remote-desktop §5.1
WDL1	magic	defined	remote-desktop §8.1
WDO1	magic	defined	remote-desktop §6.1
WDS1	magic	defined	remote-desktop §3.3
WEP1	magic	defined	live-events §5
WEV1	magic	defined	live-events §3.1
WFE1	magic	defined	fleet §3.1
WFR1	magic	defined	fleet §6.1
WGM1	magic	defined	exact-tonemap §4.1
WHD1	magic	defined	holdings §4.1
WHP1	magic	defined	http-delivery §6.2
WIC1	magic	defined	impression-aggregates §4.1
WIT1	magic	defined	impression-aggregates §5.4
WIU1	magic	defined	impression-aggregates §6.4
WJR1	magic	defined	jwp-receipts §2.7.3
WKE1	magic	defined	key-release §5.1
WKL1	magic	defined	key-release §4.1
WKT1	magic	defined	key-release §9.3
WLI1	magic	defined	receipt-ledger §6.1
WLK1	magic	defined	live-contribution §6.2
WLT1	magic	defined	receipt-ledger §4.1
WLU1	magic	defined	channel-lineup §6.1
WMA1	magic	defined	live-messaging §8
WMC1	magic	defined	live-messaging §3.1
WME1	magic	defined	live-messaging §7.3
WMG1	magic	defined	live-messaging §5.1
WMH1	magic	defined	live-metering §3.1
WMN1	magic	defined	live-moderation §5.1
WMP1	magic	defined	live-moderation §3.1
WMR1	magic	defined	live-metering §4.1
WMS1	magic	defined	live-moderation §4.2
WOR1	magic	defined	opportunity-report §7.1
WPA1	magic	defined	co-performance §7.3
WPC1	magic	defined	ad-presentation §5.1
WPF1	magic	defined	co-performance §5.6
WPH1	magic	defined	co-performance §6.3
WPI1	magic	defined	co-performance §5.1
WPJ1	magic	defined	projection §3
WPK1	magic	defined	co-performance §7.5
WPM1	magic	defined	co-performance §6.7
WPP1	magic	defined	co-performance §3.1
WPS1	magic	defined	co-performance §7.7
WPT1	magic	defined	co-performance §6.1
WPW1	magic	defined	co-performance §7.2
WQA1	magic	defined	telemetry-aggregation §7.1
WQS1	magic	defined	telemetry-aggregation §6.1
WRC1	magic	defined	revenue-share §3.1
WRD1	magic	defined	live-rooms §3.1
WRE1	magic	defined	confidentiality §3.1
WRG1	magic	defined	live-rooms §4.1
WRM1	magic	defined	live-recording §4.1
WRP1	magic	defined	live-rooms §10.5.1
WRS1	magic	defined	revenue-share §7.1
WSC1	magic	defined	stitched-presentation §5.1
WSD1	magic	defined	energy-steering §7.1
WSI1	magic	defined	stitched-presentation §4.1
WSIX	magic	defined	packaging §6
WSK1	magic	defined	prior-carriage §18.2
WSL1	magic	defined	stream-termination §3.1
WSP1	magic	defined	energy-steering §3.1
WSR1	magic	defined	exact-upscale §3.1
WSS1	magic	defined	settlement §7.1
WTM1	magic	defined	capture-binding §7.1
WTR1	magic	defined	prior-carriage §19
WTX1	magic	defined	timed-text §4.2
WUR1	magic	defined	capture-binding §6.2
WWD1	magic	defined	forensic-watermark §8.1
WWQ1	magic	defined	forensic-watermark §7.1
WWS1	magic	defined	forensic-watermark §5.1
WXC1	magic	defined	co-watch §5.1
WXK1	magic	defined	co-watch §8.4
WXP1	magic	defined	co-watch §3.1
WXS1	magic	defined	co-watch §7.1
X-WAI-EVENT	playlist-attribute	defined	live-events §8.3
X-WAI-FLOOR	playlist-attribute	defined	http-delivery §11.1
application/wai	media-type	proposed	http-delivery §3
conform-result/1	document-kind	defined	conformance-results §2
contentBinding	frame-metadata	proposed	browser-sink §7.1
id-MLDSA65-Ed25519-SHA512	scheme	defined	pq-signatures §2
mr/	path	defined	http-delivery §8.6
rcpt/	path	defined	http-delivery §8.1
science.transaction.wai-b	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-cap	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-cf	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-ch	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-clm	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-co	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-coh	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-cr	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-dec	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-drop	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-l	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-late	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-lc	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-lcf	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-lt	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-op	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-p	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-pl	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-rcpt	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-ri	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-sw	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-tx	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai-u	telemetry-key	defined	delivery-telemetry §10
science.transaction.wai.class	data-id	defined	packaging §8
science.transaction.wai.event	playlist-attribute	defined	live-events §8.3
science.transaction.wai.multivariant	data-id	defined	http-delivery §11.1
science.transaction.wai.sets	data-id	defined	http-delivery §8.7
science.transaction.wai.stages	data-id	defined	packaging §8
science.transaction.wai.timed-text	data-id	defined	timed-text §10.5
tag:transaction.science,2026:wai/access	scheme	defined	access-services §5.5
tag:transaction.science,2026:wai/class	scheme	defined	packaging §8
tag:transaction.science,2026:wai/floor	scheme	defined	http-delivery §11.1
tag:transaction.science,2026:wai/http-delivery	scheme	defined	http-delivery §11.1
tag:transaction.science,2026:wai/model/	scheme	defined	timed-text §10.3
tag:transaction.science,2026:wai/stages	scheme	defined	packaging §8
tag:transaction.science,2026:wai/timed-text	scheme	defined	timed-text §10.4
urn:wai:asset:	scheme	defined	scene-carriage §2.2
urn:wai:event:1	scheme	defined	live-events §8.4
urn:wai:event:1	catalog	defined	live-events §8.1
urn:wai:guide:	scheme	defined	channel-lineup §7.2
wai	catalog	defined	moq-streaming-format §3
wai-access-completeness	document-kind	defined	access-services §7.1
wai-age-admissions	document-kind	defined	age-assurance §7.1
wai-age-policy	document-kind	defined	age-assurance §4.1
wai-archive	document-kind	defined	exploration §5.3
wai-asset-id	scheme	defined	channel-lineup §7.2
wai-attack:	scheme	defined	robustness-evidence §4
wai-attribution	document-kind	defined	influence §5.3
wai-authorship-map	document-kind	defined	contribution §7.3
wai-c2pa	catalog	defined	live-provenance §10.2
wai-caption-quality	document-kind	defined	access-services §4.7
wai-caption-reference	document-kind	defined	access-services §4.3
wai-caption-sources	document-kind	defined	access-services §4.2
wai-catalogue	document-kind	defined	influence §3.3
wai-channel-feed	document-kind	defined	channel-lineup §4.4
wai-collection	document-kind	defined	exploration §7.1
wai-conditioning	document-kind	defined	influence §4.1
wai-contribution	document-kind	defined	contribution §6
wai-derivation	document-kind	defined	deriving-edge §5.1
wai-description	document-kind	defined	access-services §5.1
wai-detection	document-kind	defined	synthesis §7.3
wai-directed	document-kind	defined	direction §8.1
wai-distance	document-kind	defined	exploration §6.3
wai-fleet-bundle	document-kind	defined	fleet §7.1
wai-influence-report	document-kind	defined	influence §7.1
wai-int/1	scheme	defined	prior-carriage §10
wai-key-status	document-kind	defined	jwp-receipts §7.9
wai-keyframes	document-kind	defined	direction §5
wai-label-policy	document-kind	defined	synthesis §10.1
wai-mark:conformance	scheme	defined	synthesis §7.4
wai-mark:tent64	scheme	defined	synthesis §7.4
wai-mark:tent64s	scheme	defined	synthesis §7.4
wai-marking	document-kind	defined	synthesis §7.2
wai-membership	document-kind	defined	contribution §3.2
wai-module-grant	document-kind	defined	jwp-receipts §7.9
wai-module-grants	document-kind	defined	http-delivery §8.4
wai-now-next	document-kind	defined	channel-lineup §7.3
wai-origin	document-kind	defined	synthesis §3.1
wai-pick	document-kind	defined	exploration §10.2
wai-player	document-kind	defined	synthesis §10.3
wai-presentation	document-kind	defined	exact-upscale §6.2
wai-ranking	document-kind	defined	exploration §9.1
wai-rating	document-kind	defined	age-assurance §3.1
wai-receipt-index	document-kind	defined	http-delivery §8.2
wai-receipts	catalog	defined	moq-streaming-format §4.1
wai-review	document-kind	defined	synthesis §9.1
wai-robustness	document-kind	defined	robustness-evidence §5
wai-robustness-claim	document-kind	defined	robustness-evidence §8
wai-robustness-corpus	document-kind	defined	robustness-evidence §3
wai-robustness-harness:1	scheme	defined	robustness-evidence §6
wai-route-delivery-decision	document-kind	defined	route-record §6.3
wai-route-policy	document-kind	defined	route-record §3.3
wai-route-pricebook	document-kind	defined	route-record §3.2
wai-route-record	document-kind	defined	route-record §5.1
wai-route-request	document-kind	defined	route-record §3.1
wai-route-third-party-hop	document-kind	defined	route-record §6.2
wai-rung-prices	document-kind	defined	rung-price §4.1
wai-rung-request	document-kind	defined	rung-price §6.1
wai-scene/1	scheme	defined	scene-carriage §2.3
wai-sequence	document-kind	defined	direction §6
wai-session	document-kind	defined	contribution §3.1
wai-set-usage	document-kind	defined	prior-carriage §18.1
wai-signing	document-kind	defined	access-services §6.1
wai-signing-review	document-kind	defined	access-services §6.4
wai-splat-commitment	document-kind	defined	splat-exact §6.1
wai-splat-render:i1	scheme	defined	splat-exact §5
wai-splat-view	document-kind	defined	splat-exact §7
wai-step	document-kind	defined	contribution §4.1
wai-storyboard	document-kind	defined	direction §4
wai-takedown	document-kind	defined	takedown §5.3
wai-takedown-clocks	document-kind	defined	takedown §4
wai-takedown-counts	document-kind	defined	takedown §5.6
wai-takedown-match	document-kind	defined	takedown §5.4
wai-takedown-notice	document-kind	defined	takedown §5.2
wai-takedown-policy	document-kind	defined	takedown §5.1
wai-takedown-purge	document-kind	defined	takedown §5.5
wai-taste	document-kind	defined	exploration §8.1
wai-terms	document-kind	defined	influence §3.2
wai-tonemap	document-kind	defined	exact-tonemap §7.1
wai-upscale	document-kind	defined	exact-upscale §4.2
wai-usage.json	path	defined	prior-carriage §18.1
wai1	codecs-prefix	defined	http-delivery §4.1
wai1	fourcc	provisional	http-delivery Appendix B
wai2	codecs-prefix	defined	http-delivery §4.1
wai2	fourcc	provisional	http-delivery Appendix B
waiC	fourcc	provisional	http-delivery Appendix B
wai_ai_usage	catalog	defined	moq-streaming-format §4
wai_c2pa_track	catalog	defined	live-provenance §10.2
wai_capabilities	catalog	defined	moq-streaming-format §4
wai_delivery_timeout_ms	catalog	defined	packaging §8
wai_determinism	catalog	defined	moq-streaming-format §4
wai_impression_token	dap-report-extension	proposed	impression-aggregates §7.2
wai_machine_generated	catalog	defined	timed-text §7.4
wai_model	catalog	defined	timed-text §7.2
wai_origin	catalog	defined	timed-text §7.2
wai_priors	catalog	defined	moq-streaming-format §4.2
wai_receipt_alias	catalog	defined	moq-streaming-format §4
wai_receipts	catalog	defined	moq-streaming-format §4
wai_receipts_track	catalog	defined	moq-streaming-format §4
wai_staged	catalog	defined	moq-streaming-format §4.1
whm1/1	scheme	defined	prior-carriage §10.2
wsr1/1	scheme	defined	prior-carriage §10.2