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Section G.6. Updating Example

G.6. Updating Example

This example shows the structure of a PDF file as it is updated several times; it illustrates multiple body sections, cross-reference sections, and trailers. In addition, it shows that once an object has been assigned an object identifier, it keeps that identifier until the object is deleted, even if the object is altered. Finally, the example illustrates the reuse of cross-reference entries for objects that have been deleted, along with the incrementing of the generation number after an object has been deleted.

The original file is the one shown in Example G.1 on page 976. The updates are divided into four stages, with the file saved after each stage:


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