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                                                  141
             SECTION 3.6                                                     Document Structure



KEY                  TYPE          VALUE

AA                   dictionary    (Optional; PDF 1.4) An additional-actions dictionary defining the ac-
                                   tions to be taken in response to various trigger events affecting the docu-
                                   ment as a whole (see “Trigger Events” on page 648). (See also
                                   implementation note 34 in Appendix H.)

URI                  dictionary    (Optional; PDF 1.1) A URI dictionary containing document-level infor-
                                   mation for URI (uniform resource identifier) actions (see “URI Actions”
                                   on page 662).

AcroForm             dictionary    (Optional; PDF 1.2) The document’s interactive form (AcroForm) dictio-
                                   nary (see Section 8.6.1, “Interactive Form Dictionary”).

Metadata             stream        (Optional; PDF 1.4; must be an indirect reference) A metadata stream
                                   containing metadata for the document (see Section 10.2.2, “Metadata
                                   Streams”).

StructTreeRoot       dictionary    (Optional; PDF 1.3) The document’s structure tree root dictionary (see
                                   Section 10.6.1, “Structure Hierarchy”).

MarkInfo             dictionary    (Optional; PDF 1.4) A mark information dictionary containing informa-
                                   tion about the document’s usage of Tagged PDF conventions (see Sec-
                                   tion 10.6, “Logical Structure”).

Lang                 text string   (Optional; PDF 1.4) A language identifier specifying the natural language
                                   for all text in the document except where overridden by language speci-
                                   fications for structure elements or marked content (see Section 10.8.1,
                                   “Natural Language Specification”). If this entry is absent, the language is
                                   considered unknown.

SpiderInfo           dictionary    (Optional; PDF 1.3) A Web Capture information dictionary containing
                                   state information used by the Acrobat Web Capture (AcroSpider) plug-
                                   in extension (see Section 10.9.1, “Web Capture Information Dictio-
                                   nary”).

OutputIntents        array         (Optional; PDF 1.4) An array of output intent dictionaries describing the
                                   color characteristics of output devices on which the document might be
                                   rendered (see “Output Intents” on page 970).

PieceInfo            dictionary    (Optional; PDF 1.4) A page-piece dictionary associated with the docu-
                                   ment (see Section 10.4, “Page-Piece Dictionaries”).

OCProperties         dictionary    (Optional; PDF 1.5; required if a document contains optional content) The
                                   document’s optional content properties dictionary (see Section 4.10.3,
                                   “Configuring Optional Content”).

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