SECTION 10.7
901
Tagged PDF
STRUCTURE TYPE
DESCRIPTION
NonStruct
(Nonstructural element) A grouping element having no inherent structural significance; it
serves solely for grouping purposes. This type of element differs from a division (structure
type
Div
; see above) in that it is not interpreted or exported to other document formats; how-
ever, its descendants are to be processed normally.
(Private element) A grouping element containing private content belonging to the applica-
tion producing it. The structural significance of this type of element is unspecified and is de-
termined entirely by the producer application. Neither the
Private
element nor any of its
descendants are to be interpreted or exported to other document formats.
Private
Block-Level Structure Elements
A
block-level structure element (BLSE)
is any region of text or other content that is
laid out in the block-progression direction, such as a paragraph, heading, list
item, or footnote. A structure element is a BLSE if its structure type (after role
mapping, if any) is one of those listed in Table 10.21. All other standard structure
types are treated as ILSEs, with the following exceptions:
•
TR
(Table row),
TH
(Table header),
TD
(Table data),
THead
(Table head),
TBody
(Table body), and
TFoot
(Table footer), which are used to group elements with-
in a table and are considered neither BLSEs nor ILSEs
•
Elements with a
Placement
attribute (see “General Layout Attributes” on page
Inline
TABLE 10.21 Block-level structure elements
CATEGORY
STRUCTURE TYPES
Paragraphlike elements
P
H
H1
H2
H3
Lbl
LBody
H4
H5
H6
List elements
Table element
L
LI
Table
In many cases, a BLSE appears as one compact, contiguous piece of page content;
in other cases, it is discontiguous. Examples of the latter include a BLSE that
extends across a page boundary or is interrupted in the page content order by
another, nested BLSE or a directly included footnote. When necessary, Tagged