CBLDictionaryFragment
@protocol CBLDictionaryFragment <NSObject>CBLDictionaryFragment protocol provides subscript access to CBLFragment objects by key.
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                  Subscript access to a CBLFragment object by key. DeclarationObjective-C - (nullable CBLFragment *)objectForKeyedSubscript:(nonnull NSString *)key;Swift subscript(key: Any!) -> CBLFragment? { get }ParameterskeyThe key. Return ValueThe CBLFragment object. 
 CBLDictionaryFragment Protocol Reference
        CBLDictionaryFragment Protocol Reference