NotebookDocumentCellChange   
    Describes a change to a notebook cell.
See also
Properties
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                  The affected cell.
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                  The document of the cell or undefined when it did not change.
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                  The new execution summary of the cell or undefined when it did not change.
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                  The new metadata of the cell or undefined when it did not change.
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                  The new outputs of the cell or undefined when they did not change.