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Note: No page object can be speci ed for a destination associated with a remote go-to action (see Remote Go-To Actions on page 520), because the destination page is in a different PDF document In this case, the page parameter speci es a page number within the remote document instead of a page object in the current document
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Instead of being de ned directly, using the explicit syntax shown in Table 82, a destination may be referred to indirectly, using a name object (PDF 11) or a string (PDF 12) This capability is especially useful when the destination is located in another PDF document For example, a link to the beginning of 6 in another document might refer to the destination by a name such as Chap6begin instead of giving an explicit page number in the other document This would allow the location of the chapter opening to change within the other document without invalidating the link If an annotation or outline item that refers to a named destination has an associated action, such as a remote go-to action (see Remote Go-To Actions on page 520) or a thread action ( Thread Actions on page 522), the destination is in the le speci ed by the action s F entry, if any; if there is no F entry, the destination is in the current le In PDF 11, the correspondence between name objects and destinations is de ned by the Dests entry in the document catalog (see Section 361, Document Catalog ) The value of this entry is a dictionary in which each key is a destination name and the corresponding value is either an array de ning the destination, using the syntax shown in Table 82, or a dictionary with a D entry whose value is such an array The latter form allows additional attributes to be associated with the destination, as well as enabling a go-to action (see Go-To Actions on page 519) to be used as the target of a named destination In PDF 12, the correspondence between strings and destinations is de ned by the Dests entry in the document s name dictionary (see Section 363, Name Dictionary ) The value of this entry is a name tree (Section 384, Name Trees ) mapping name strings to destinations (The keys in the name tree may be treated as text strings for display purposes) The destination value associated with a key in the name tree may be either an array or a dictionary, as described in the preceding paragraph
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Note: The use of strings as destination names is a PDF 12 feature If compatibility with earlier versions of PDF is required, only name objects may be used to refer to named destinations Where such compatibility is not a consideration, however, applications that generate large numbers of named destinations should use the string form of representation instead, since there are essentially no implementation limits
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A PDF document may optionally display a document outline on the screen, allowing the user to navigate interactively from one part of the document to another The outline consists of a tree-structured hierarchy of outline items (sometimes called bookmarks), which serve as a visual table of contents to display the document s structure to the user The user can interactively open and close individual items by clicking them with the mouse When an item is open, its immediate children in the hierarchy become visible on the screen; each child may in turn be open or closed, selectively revealing or hiding further parts of the hierarchy When an item is closed, all of its descendants in the hierarchy are hidden Clicking the text of any visible item with the mouse activates the item, causing the viewer application to jump to a destination or trigger an action associated with the item The root of a document s outline hierarchy is an outline dictionary speci ed by the Outlines entry in the document catalog (see Section 361, Document Catalog ) Table 83 shows the contents of this dictionary Each individual outline item within the hierarchy is de ned by an outline item dictionary (Table 84) The items at each level of the hierarchy form a linked list, chained together through their Prev and Next entries and accessed through the First and Last entries in the parent item (or in the outline dictionary in the case of top-level items) When displayed on the screen, the items at a given level appear in the order in which they occur in the linked list (See also implementation note 55 in Appendix H)
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