DictionaryReference 
    References a dictionary by its properties.
Using a reference, each access goes through the cache first, so that outdated instances of a dictionary (i.e. those flushed when clearing the cache) are not used anymore. This ensures that only the latest instance of that dictionary is used, which is important when a dictionary has to be used both before and after clearing a cache.
Properties
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                  True if this dictionary refers to a BundledDictionary.
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                  The dictionary that is referred to by this reference, as fetched from the cache.
Functions
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                  Throws an InvalidDictionaryException iff this dictionary is currently invalid.