CHAPTER 10
862
Document Interchange
Marked-Content Sequences as Content Items
A sequence of graphics operators in a content stream can be specified as a con-
tent item of a structure element in the following way:
•
The operators must be bracketed as a marked-content sequence between
BDC
and
EMC
operators (see Section 10.5, “Marked Content”)
Note:
Although the tag associated with a marked-content sequence is not directly
related to the document’s logical structure, it should be the same as the structure
type of the associated structure element.
•
The marked-content sequence must have a property list (see Section 10.5.1,
MCID
entry, which is an integer
marked-content
identifier
that uniquely identifies the marked-content sequence within its con-
tent stream, as shown in the following example:
Example 10.7
2 0 obj
<< /Type /Page
/Contents 3 0 R
…
>>
endobj
3 0 obj
<< /Length … >>
stream
…
/P << /MCID 0 >>
BDC
…
( Here is some text ) Tj
…
EMC
…
endstream
endobj
% Page object
% Content stream
% Page's content stream
% Start of marked-content sequence
% End of marked-content sequence
Note:
This example and the following examples omit required
StructParents
entries
in the objects used as content items (see “Finding Structure Elements from Content