SECTION 3.6
139
Document Structure
TABLE 3.25 Entries in the catalog dictionary
KEY
TYPE
VALUE
Type
name
name
(Required)
The type of PDF object that this dictionary describes; must
be
Catalog
for the catalog dictionary.
(Optional; PDF 1.4)
The version of the PDF specification to which the
document conforms (for example,
1.4
) if later than the version specified
in the file’s header (see Section 3.4.1, “File Header”). If the header speci-
fies a later version, or if this entry is absent, the document conforms to
the version specified in the header. This entry enables a PDF producer
application to update the version using an incremental update; see Sec-
tion 3.4.5, “Incremental Updates.” (See implementation note 33 in Ap-
pendix H.)
Note:
The value of this entry is a name object, not a number, and therefore
must be preceded by a slash character (
/
) when written in the PDF file (for
example,
/1.4
).
Version
Pages
dictionary
number tree
(Required; must be an indirect reference)
The
page tree node
that is the
root of the document’s
page tree
(see Section 3.6.2, “Page Tree”).
(Optional; PDF 1.3)
A number tree (see Section 3.8.6, “Number Trees”)
defining the page labeling for the document. The keys in this tree are
page indices; the corresponding values are
page label dictionaries
(see
Section 8.3.1, “Page Labels”). Each page index denotes the first page in a
labeling range
to which the specified page label dictionary applies. The
tree must include a value for page index 0.
(Optional; PDF 1.2)
The document’s name dictionary (see Section 3.6.3,
“Name Dictionary”).
(Optional; PDF 1.1; must be an indirect reference)
A dictionary of names
and corresponding
destinations
(see “Named Destinations” on page
583).
(Optional; PDF 1.2)
A viewer preferences dictionary (see Section 8.1,
“Viewer Preferences”) specifying the way the document is to be dis-
played on the screen. If this entry is absent, applications should use their
own current user preference settings.
PageLabels
Names
dictionary
dictionary
Dests
ViewerPreferences
dictionary
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