Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3, actions/setup-dotnet@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

Nullability of reference types in type of parameter 'value' of 'void SroStix.SpecVersion.set' doesn't match implicitly implemented member 'void ISroStix.SpecVersion.set' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'value' of 'void SdoStix.SpecVersion.set' doesn't match implicitly implemented member 'void ISdoStix.SpecVersion.set' (possibly because of nullability attributes).

Nullability of reference types in return type of 'string? SdoStix.CreatedByRef.get' doesn't match implicitly implemented member 'string ISdoStix.CreatedByRef.get' (possibly because of nullability attributes).

Nullability of reference types in return type of 'List<string>? SdoStix.Labels.get' doesn't match implicitly implemented member 'List<string> ISdoStix.Labels.get' (possibly because of nullability attributes).

Nullability of reference types in return type of 'string? SdoStix.Lang.get' doesn't match implicitly implemented member 'string ISdoStix.Lang.get' (possibly because of nullability attributes).

Nullability of reference types in return type of 'List<ExternalReference>? SdoStix.ExternalReferences.get' doesn't match implicitly implemented member 'List<ExternalReference> ISdoStix.ExternalReferences.get' (possibly because of nullability attributes).

Nullability of reference types in return type of 'List<string>? SdoStix.ObjectMarkingRefs.get' doesn't match implicitly implemented member 'List<string> ISdoStix.ObjectMarkingRefs.get' (possibly because of nullability attributes).

Nullability of reference types in return type of 'List<GranularMarking>? SdoStix.GranularMarkings.get' doesn't match implicitly implemented member 'List<GranularMarking> ISdoStix.GranularMarkings.get' (possibly because of nullability attributes).

Nullability of reference types in return type of 'Dictionary<string, byte[]>? SdoStix.Extensions.get' doesn't match implicitly implemented member 'Dictionary<string, byte[]> ISdoStix.Extensions.get' (possibly because of nullability attributes).