basis property
Basis is the KIND of permission this publisher's data reaches you under: licence (an explicit grant), registry (the registry of record publishing for anyone to consult), operator (an operator's own machine-readable statement about its own network, published for third parties to filter by — not a licence, and not claimed as one), own (computed here), or none (nothing reaches you: the membership is held by the component that screens against it). It is on the wire so the licence position is an audit you can run.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? basis;