| An action that is associated with a component. This is used in several areas of Tapestry and is
primarily an attempt to externalize state for a component so that it can be recorded outside the
object.
ComponentActions should be immutable. They are often created during one request and associated
with a particular component instance. They are then used in a later request (with an equivalent
component instance).
ComponentActions are serializable (they are often serialized into Base64 strings for storage on
the client).
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