CHAPTER 10
10
Document Interchange
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
•
Metadata
a component of a document, such as its title, author, and creation and modifi-
cation dates
•
File identifiers
•
Page-piece dictionaries
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
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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