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                                                  359
            SECTION 4.9                                                             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”).

Metadata         stream       (Optional; PDF 1.4) A metadata stream containing metadata for the form
                              XObject (see Section 10.2.2, “Metadata Streams”).

PieceInfo        dictionary   (Optional; PDF 1.3) A page-piece dictionary associated with the form
                              XObject (see Section 10.4, “Page-Piece Dictionaries”).

LastModified     date         (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”).

StructParent     integer      (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).

StructParents    integer      (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.

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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