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                                CHAPTER 10


            Document Interchange
           10




The features described in this chapter do not affect the final appearance of a doc-
ument. Rather, these features enable a document to include higher-level informa-
tion that is useful for the interchange of documents among applications:

• Procedure sets (Section 10.1) that define the implementation of PDF operators
• Metadata (Section 10.2) consisting of general information about a document or
  a component of a document, such as its title, author, and creation and modifi-
  cation dates
• File identifiers (Section 10.3) for reliable reference from one PDF file to another
• Page-piece dictionaries (Section 10.4) allowing an application to embed private
  data in a PDF document for its own use
• Marked-content operators (Section 10.5) for identifying portions of a content
  stream and associating them with additional properties or externally specified
  objects
• Logical structure facilities (Section 10.6) for imposing a hierarchical organiza-
  tion on the content of a document
• Tagged PDF (Section 10.7), a set of conventions for using the marked content
  and logical structure facilities to facilitate the extraction and reuse of a docu-
  ment’s content for other purposes
• Various ways of increasing the accessibility of a document to users with disabil-
  ities (Section 10.8), including the identification of the natural language in
  which it is written (such as English or Spanish) for the benefit of a text-to-
  speech engine




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