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Adds a dictionary entry with "placeholder" (spaces) the actual value should be written later, used when generating linearized PDF stream.
public void AddDictEntryPlaceHolder(PdfName key, int placeHolderLength, out long placeHolderOffset)
Public Sub AddDictEntryPlaceHolder(key As PdfName, placeHolderLength As Integer, ByRef placeHolderOffset As Long)