public sealed class Visibility : IMessage<Visibility>, IEquatable<Visibility>, IDeepCloneable<Visibility>, IBufferMessage, IMessage
Visibility restricts service consumer's access to service elements,
such as whether an application can call a visibility-restricted method.
The restriction is expressed by applying visibility labels on service
elements. The visibility labels are elsewhere linked to service consumers.
A service can define multiple visibility labels, but a service consumer
should be granted at most one visibility label. Multiple visibility
labels for a single service consumer are not supported.
If an element and all its parents have no visibility label, its visibility
is unconditionally granted.