Gets the intended uses of the group (Intent, a name or an array of names): View when absent.
public IReadOnlyList<CosName> Intents { get; }
ISO 32000-2 §8.11.2.1, Table 96, and §8.11.2.3. View and Design are defined; second-class names may appear. An
array element that is not a name is skipped, and a value that is neither a name nor an array reads as View, each with an
OptionalContentGroupInvalid diagnostic.