CBLMutableDictionaryFragment
@protocol CBLMutableDictionaryFragment <CBLDictionaryFragment>CBLMutableDictionaryFragment protocol provides subscript access to CBLMutableFragment objects by key.
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                  Subscript access to a CBLMutableFragment object by key. DeclarationObjective-C - (nullable CBLMutableFragment *)objectForKeyedSubscript: (nonnull NSString *)key;ParameterskeyThe key. Return ValueThe CBLMutableFragment object. 
 CBLMutableDictionaryFragment Protocol Reference
        CBLMutableDictionaryFragment Protocol Reference