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10.3. File Identifiers

PDF files may contain references to other PDF files (see Section 3.10, “File Specifications”). Simply storing a file name, however, even in a platform-independent format, does not guarantee that the file can be found. Even if the file still exists and its name has not been changed, different server software applications may identify it in different ways. For example, servers running on DOS platforms must convert all file names to 8 characters and a 3-character extension. Different servers may use different strategies for converting longer file names to this format.

External file references can be made more reliable by including a file identifier (PDF 1.1) in the file and using it in addition to the normal platform-based file designation. Matching the identifier in the file reference with the one in the file confirms whether the correct file was found.


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