CHAPTER 10
902
Document Interchange
PDF consumer applications can recognize such fragmented BLSEs from the logi-
cal structure and use this information to reassemble them and properly lay them
out.
Paragraphlike Elements
paragraphlike elements
that consist of
running text and other content laid out in the form of conventional paragraphs
(as opposed to more specialized layouts such as lists and tables).
TABLE 10.22 Standard structure types for paragraphlike elements
STRUCTURE TYPE
DESCRIPTION
H
(Heading) A label for a subdivision of a document’s content. It should be the first child of
the division that it heads.
Headings with specific levels, for use in applications that cannot hierarchically nest their
sections and thus cannot determine the level of a heading from its level of nesting.
(Paragraph) A low-level division of text.
H1
–
H6
P
List Elements
The structure types described in Table 10.23 are used for organizing the content
of lists. Section G.7, “Structured Elements That Describe Hierarchical Lists” pro-
vides an example of nested list entries.
TABLE 10.23 Standard structure types for list elements
STRUCTURE TYPE
DESCRIPTION
L
(List) A sequence of items of like meaning and importance. Its immediate children should
be an optional caption (structure type
Caption
; see “Grouping Elements” on page 899) fol-
lowed by one or more list items (structure type
LI
; see below).
(List item) An individual member of a list. Its children may be one or more labels, list bod-
ies, or both (structure types
Lbl
or
LBody
; see below).
(Label) A name or number that distinguishes a given item from others in the same list or
other group of like items. In a dictionary list, for example, it contains the term being de-
fined; in a bulleted or numbered list, it contains the bullet character or the number of the
list item and associated punctuation.
LI
Lbl