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                                                      877
       SECTION 10.6                                                                  Logical Structure



KEY   TYPE           VALUE

H     boolean        (Optional) If true, the attribute is hidden; that is, it should not be shown in any user inter-
                     face element that presents the attributes of an object. Default value: false.

       PDF documents that contain user properties must provide a UserProperties entry
       with a value of true in the document’s mark information dictionary (see
       Table 10.8). This entry allows consumer applications to quickly determine
       whether it is necessary to search the structure tree for elements containing user
       properties.

       Example 10.14 shows a structure element containing user properties called Part
       Name, Part Number, Supplier, and Price.

       Example 10.14

             100 0 obj
                << /Type /StructElem
                   /S /Figure                                           % Structure type
                   /P 50 0 R                                            % Parent in structure tree
                   /A << /O /UserProperties                             % Attribute object
                          /P [                                          % Array of user properties
                               << /N (Part Name) /V (Framostat) >>
                               << /N (Part Number) /V 11603 >>
                               << /N (Supplier) /V (Just Framostats) /H true >> % Hidden attribute
                               << /N (Price) /V -37.99 /F ($37.99) >>             % Formatted value
                               ]
                       >>
                >>
             endobj


10.6.5 Example of Logical Structure

       Example 10.15 shows portions of a PDF file with a simple document structure.
       The structure tree root (object 300) contains elements with structure types Chap
       (object 301) and Para (object 304). The Chap element, titled Chapter 1, contains
       elements with types Head1 (object 302) and Para (object 303).

       These elements are mapped to the standard structure types specified in Tagged
       PDF (see Section 10.7.3, “Standard Structure Types”) by means of the role map
       specified in the structure tree root. Objects 302 through 304 have attached at-
       tributes (see Section 10.6.4, “Structure Attributes”and Section 10.7.4, “Standard
       Structure Attributes”).

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