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rƆrÇjjƆrÈjˆXˆ/*
 * Model of views in object-oriented programming.
 *
 * Two object references, called the view and the backing,
 * are related by a view mechanism when changes to the
 * backing are automatically propagated to the view. Note
 * that the state of a view need not be a projection of the
 * state of the backing; the keySet method of Map, for
 * example, produces two view relationships, and for the
 * one in which the map is modified by changes to the key
 * set, the value of the new map cannot be determined from
 * the key set. Note that in the iterator view mechanism,
 * the iterator is by this definition the backing object,
 * since changes are propagated from iterator to collection
 * and not vice versa. Oddly, a reference may be a view of
 * more than one backing: there can be two iterators on the
 * same collection, eg. A reference cannot be a view under
 * more than one view type.
 *
 * A reference is made dirty when it is a backing for a view
 * with which it is no longer related by the view invariant.
 * This usually happens when a view is modified, either
 * directly or via another backing. For example, changing a
 * collection directly when it has an iterator invalidates
 * it, as does changing the collection through one iterator
 * when there are others.
 *
 * More work is needed if we want to model more closely the
 * failure of an iterator when its collection is invalidated.
 *
 * As a terminological convention, when there are two
 * complementary view relationships, we will give them types
 * t and t'. For example, KeySetView propagates from map to
 * set, and KeySetView' propagates from set to map.
 *
 * author: Daniel Jackson
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