TCI11 — Issue: SelectionEvent takes a single Entity parameter

A translation error occurred from the java PSM to the specification source files. This should be a Collection or List of Entity objects, rather than a single Entity. The affected methods are:
• Constructor
• getEntities
To ensure the integrity of the event object, the internally stored Collection or List should be unmodifiable. This can be easily achieved by copying the List and invoking Collections.unmodifiableList(source).