SECTION 4.9
359
Form XObjects
KEY
TYPE
VALUE
Group
dictionary
(Optional; PDF 1.4)
A
group attributes dictionary
indicating that the contents
of the form XObject are to be treated as a group and specifying the attributes
of that group (see Section 4.9.2, “Group XObjects”).
Note:
If a
Ref
entry (see below) is present, the group attributes also apply to the
external page imported by that entry, which allows such an imported page to be
treated as a group without further modification.
Ref
dictionary
(Optional; PDF 1.4)
A reference dictionary identifying a page to be imported
from another PDF file, and for which the form XObject serves as a proxy (see
(Optional; PDF 1.4)
A
metadata stream
containing metadata for the form
XObject (see Section 10.2.2, “Metadata Streams”).
(Optional; PDF 1.3)
A page-piece dictionary associated with the form
XObject (see Section 10.4, “Page-Piece Dictionaries”).
(Required if
PieceInfo
is present; optional otherwise; PDF 1.3)
The date and
time (see Section 3.8.3, “Dates”) when the form XObject’s contents were most
recently modified. If a page-piece dictionary (
PieceInfo
) is present, the modi-
fication date is used to ascertain which of the application data dictionaries it
contains correspond to the current content of the form (see Section 10.4,
(Required if the form XObject is a structural content item; PDF 1.3)
The inte-
ger key of the form XObject’s entry in the structural parent tree (see “Finding
(Required if the form XObject contains marked-content sequences that are
structural content items; PDF 1.3)
The integer key of the form XObject’s entry
in the structural parent tree (see “Finding Structure Elements from Content
Note:
At most one of the entries
StructParent
or
StructParents
may be present. A
form XObject can be either a content item in its entirety or a container for
marked-content sequences that are content items, but not both.
Metadata
stream
dictionary
date
PieceInfo
LastModified
StructParent
integer
StructParents
integer
OPI
dictionary
(Optional; PDF 1.2)
An OPI version dictionary for the form XObject (see