SECTION 10.6
855
Logical Structure
marked-content sequence
S3
and the marked-content point
P1
are both part of
sequence
S2
, and
S2
,
S3
, and
P1
are all part of sequence
S1
.
Example 10.5
/S1 BMC
…
Clipping path
…
/S2 BMC
/S3 BMC
EMC
/P1 DP
EMC
EMC
In Example 10.6, marked-content sequences
S1
and
S4
are marked clipping
sequences because the only object they contain is a clipping path. Hence the
clipping path is part of sequences
S1
and
S4
;
S3
is part of
S2
; and
S2
,
S3
, and
S4
are
all part of
S1
.
Example 10.6
/S1 BMC
/S2 BMC
/S3 BMC
EMC
EMC
/S4 BMC
…
Clipping path
…
EMC
EMC
10.6 Logical Structure
PDF’s
logical structure
facilities
(PDF 1.3)
provide a mechanism for incorporating
structural information about a document’s content into a PDF file. Such in-
formation might include, for example, the organization of the document into
chapters and sections or the identification of special elements such as figures,
tables, and footnotes. The logical structure facilities are extensible, allowing
applications that produce PDF files to choose what structural information to
include and how to represent it, while enabling PDF consumers to navigate a file
without knowing the producer’s structural conventions.