§10.15.

PUBLISH_NAMESPACE

The publisher sends the PUBLISH_NAMESPACE message as the first message on a new bidi stream to advertise that it has tracks available within a Track Namespace. The receiver verifies the publisher is authorized to publish tracks under this namespace.

PUBLISH_NAMESPACE Message {
  Type (vi64) = 0x6,
  Length (16),
  Request ID (vi64),
  Track Namespace (..),
  Number of Parameters (vi64),
  Parameters (..) ...
}
Figure 17: MOQT PUBLISH_NAMESPACE Message

This is one section of the MoQT specification, rendered per-section for quick reference and citation. The authoritative text is draft-ietf-moq-transport-19 at the IETF.