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                                                  381
         SECTION 4.10                                                           Optional Content



KEY           TYPE         VALUE

Export        dictionary   (Optional) A dictionary containing one entry, ExportState, a name whose value
                           may be ON or OFF. This value indicates the recommended state for content in this
                           group when the document (or part of it) is saved by a viewer application to a for-
                           mat that does not support optional content (for example, an earlier version of
                           PDF or a raster image format).

Zoom          dictionary   (Optional) A dictionary specifying a range of magnifications at which the content
                           in this optional content group is best viewed. It may contain one or both of the
                           following entries:
                           • min: The minimum recommended magnification factor at which the group
                             should be ON. Default value: 0.
                           • max: The magnification factor below which the group should be ON. Default
                             value: infinity.

Print         dictionary   (Optional) A dictionary specifying that the content in this group is intended for
                           use in printing. It contains the following optional entries:
                           • Subtype: A name object specifying the kind of content controlled by the group;
                             for example, Trapping, PrintersMarks and Watermark.
                           • PrintState: A name that may be ON or OFF, indicating that the group should be
                             set to that state when the document is printed from a viewer application.

View          dictionary   (Optional) A dictionary that has a single entry, ViewState, a name that may have a
                           value of ON or OFF, indicating that the group should be set to that state when the
                           document is opened in a viewer application.

User          dictionary   (Optional) A dictionary specifying one or more users for whom this optional con-
                           tent group is primarily intended. Each dictionary has two required entries:
                           • Type: A name object that can be Ind (individual), Ttl (title), or Org (organiza-
                             tion).
                           • Name: A text string or array of text strings representing the name(s) of the in-
                             dividual, position or organization.

PageElement   dictionary   (Optional) A dictionary declaring that the group contains a pagination artifact. It
                           contains one entry, Subtype, whose value is a name that can be HF (header/foot-
                           er), FG (foreground image or graphic), BG (background image or graphic), or L
                           (logo).

         While the data in the usage dictionary can be viewed as information for a docu-
         ment user to examine, it can also be used by viewer applications to automatically

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