CBLArrayFragment
@protocol CBLArrayFragment <NSObject>CBLArrayFragment protocol provides subscript access to CBLFragment objects by index.
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                  Subscript access to a CBLFragment object by index. DeclarationObjective-C - (nullable CBLFragment *)objectAtIndexedSubscript:(NSUInteger)index;ParametersindexThe index. Return ValueThe CBLFragment object. 
 CBLArrayFragment Protocol Reference
        CBLArrayFragment Protocol Reference