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Chapter 10. Document Interchange > Page-Piece Dictionaries

10.4. Page-Piece Dictionaries

A page-piece dictionary (PDF 1.3) can be used to hold private application data. The data can be associated with a page or form XObject by means of the optional PieceInfo entry in the page object (see Table 3.27 on page 119) or form dictionary (see Table 4.45 on page 328). Beginning with PDF 1.4, private data may also be associated with the PDF document by means of the PieceInfo entry in the document catalog (see 3.25 on page 114).

Applications can use this dictionary as a place to store private data in connection with that document, page, or form. Such private data can convey information meaningful to the application that produces it (such as information on object grouping for a graphics editor or the layer information used by Adobe Photoshop®) but is typically ignored by general-purpose PDF viewer applications.


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