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TABLE 913 Additional dictionary entries for structure element access
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KEY TYPE VALUE
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StructParent StructParents
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integer integer
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(Required for all objects that are structural content items; PDF 13) The integer key of this object s entry in the structural parent tree (Required for all content streams containing marked-content sequences that are structural content items; PDF 13) The integer key of this object s entry in the structural parent tree Note: At most one of these two entries may be present in a given object An object can be either a content item in its entirety or a container for marked-content sequences that are content items, but not both
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For a content item identi ed by an object reference, the parent structure element can thus be found by using the value of the StructParent entry in the item s object dictionary as a retrieval key in the structural parent tree (found in the ParentTree entry of the structure tree root) The corresponding value retrieved from the parent tree is a reference to the parent structure element (see Example 911)
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Example 911 1 0 obj << /Type /StructElem /K << /Type /OBJR /Pg 2 0 R /Obj 4 0 R >> >> endobj % Parent structure element
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% Object reference % Page containing form XObject % Reference to form XObject
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2 0 obj % Page object << /Type /Page /Resources << /XObject << /Fm4 4 0 R >> % Resource dictionary >> % containing form XObject /Contents 3 0 R % Content stream >> endobj
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S E CTIO N 9 6
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3 0 obj << /Length >> stream /Fm4 Do endstream endobj 4 0 obj << /Type /XObject /Subtype /Form /Length /StructParent 6 >> stream endstream endobj 100 0 obj << /Nums [ 0 101 0 R 1 102 0 R 6 10R ] >> endobj
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% Page's content stream
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% Paint form XObject
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% Parent tree key
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% Parent tree (accessed from structure tree root)
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% Entry for page object 2; points back % to parent structure element
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For a content item that is a marked-content sequence, the retrieval method is similar but slightly more complicated Because a marked-content sequence is not an object in its own right, its parent tree key is found in the StructParents entry of the page object or other content stream in which the sequence resides The value retrieved from the parent tree is not a reference to the parent structure element itself, but rather an array of such references one for each marked-content sequence contained within that content stream The parent structure element for the given sequence is found by using the sequence s marked-content identi er as an index into this array (see Example 912)
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Example 912 1 0 obj << /Type /StructElem /Pg 2 0 R /K 0 >> endobj 2 0 obj << /Type /Page /Contents 3 0 R /StructParents 6 >> endobj 3 0 obj << /Length >> stream /P << /MCID 0 >> BDC (Here is some text) TJ EMC endstream endobj 100 0 obj << /Nums [ 0 101 0 R 1 102 0 R 6 [1 0 R] ] >> endobj % Parent structure element
% Page containing marked-content sequence % Marked-content identi er
% Page object % Content stream % Parent tree key
% Page's content stream
% Start of marked-content sequence
% End of marked-content sequence
% Parent tree (accessed from structure tree root)
% Entry for page object 2; array element at index 0 % points back to parent structure element
S E CTIO N 9 6
Logical Structure
964 Structure Attributes
An application or plug-in extension that processes logical structure can attach additional information, called attributes, to any structure element The attribute information is held in an attribute object associated with the structure element Any dictionary or stream can serve as an attribute object by including an O entry (see Table 914) identifying the application or plug-in that owns the attribute information; the owner can then add any additional entries it wishes to the object to hold the attributes To facilitate the interchange of content among PDF applications, Adobe has de ned a set of standard structure attributes, identi ed by speci c standard owners; see Section 975, Standard Structure Attributes
TABLE 914 Entry common to all attribute objects
KEY TYPE VALUE
name
(Required) The name of the application or plug-in extension owning the attribute data The name must conform to the guidelines described in Appendix E
Any application can attach attributes to any structure element, even one created by another application Multiple applications can attach attributes to the same structure element; the A entry in the structure element dictionary (see Table 910 on page 591) can hold either a single attribute object or an array of such objects, together with revision numbers for coordinating attributes created by different owner (see Attribute Revision Numbers on page 606) An application creating or destroying the second attribute object for a structure element is responsible for converting the value of the A entry from a single object to an array or vice versa, as well as for maintaining the integrity of the revision numbers No inherent order is de ned for the attribute objects in an A array, but it is considered good practice to add new objects at the end of the array so that the rst array element is the one belonging to the application that originally created the structure element