In this chapter, we discuss four topics related not to the visual
appearance of a PDF document, but to the ancillary data which may also be
included for interactive, onscreen use of documents, and the metadata used
to carry extra information with a document for use by programs in a PDF
Data structures defining a position within a file. They can be
used to specify where a bookmark or
hyperlink points to. Bookmarks (properly called
the document outline) are used as a table of
contents for the document.
A stream containing an XML file in a specified format,
containing some of the same metadata as the document information
dictionary, together with additional fields.
Allow whole files to be encapsulated in a document, much like an
Allow text and graphics to be applied on top of a PDF page,
separate from the main page content, for display by onscreen readers.
One particular kind of annotation is the
hyperlink, which allows a user to click
somewhere on a page and be redirected to a destination elsewhere in
Bookmarks and Destinations
A document’s bookmarks (properly called the
document outline) are a tree of entries (typically
titles of chapters, sections, paragraphs etc.) which can be clicked on in
a PDF viewer to move around the document. Each entry has some text and a
destination describing where it links to.
A destination defines a place ...
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