CBLDocumentFragment
@interface CBLDocumentFragment : NSObject <CBLDictionaryFragment>CBLDocumentFragment provides access to a document object. CBLDocumentFragment also provides subscript access by either key or index to the data values of the document which are wrapped by CBLFragment objects.
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                  Checks whether the document exists in the database or not. DeclarationObjective-C @property (nonatomic, readonly) BOOL exists;
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                  Gets the document from the document fragment object. DeclarationObjective-C @property (nonatomic, readonly, nullable) CBLDocument *document;
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                  Unavailable Not available DeclarationObjective-C - (nonnull instancetype)init;
 CBLDocumentFragment Class Reference
        CBLDocumentFragment Class Reference