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A PDFPageLabel changes the properties of numbering at the page on which it appears (see the class 'PDFPageLabels' for specifying where a PDFPageLabel is associated) and all subsequent pages, until a new PDFPageLabel is encountered. The arguments to this initialiser determine the properties of all subsequent page labels. 'style' determines the numberings style, arabic, roman, letters; 'start' specifies the starting number; and 'prefix' any prefix to be applied to the page numbers. All these arguments can be left out or set to None. * style: - None: No numbering, can be used to display the prefix only. - PDFPageLabel.ARABIC: Use arabic numbers: 1, 2, 3, 4... - PDFPageLabel.ROMAN_UPPER: Use upper case roman numerals: I, II, III... - PDFPageLabel.ROMAN_LOWER: Use lower case roman numerals: i, ii, iii... - PDFPageLabel.LETTERS_UPPER: Use upper case letters: A, B, C, D... - PDFPageLabel.LETTERS_LOWER: Use lower case letters: a, b, c, d... * start: - An integer specifying the starting number for this PDFPageLabel. This can be used when numbering style changes to reset the page number back to one, ie from roman to arabic, or from arabic to appendecies. Can be any positive integer or None. I'm not sure what the effect of specifying None is, probably that page numbering continues with the current sequence, I'd have to check the spec to clarify though. * prefix: - A string which is prefixed to the page numbers. 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