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
Section 4.9.3, “Reference XObjects”).
(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,
“Page-Piece Dictionaries”).
(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
Structure Elements from Content Items” on page 868).
(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
Items” on page 868).
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
Section 10.10.6, “Open Prepress Interface (OPI)”).
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