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            <div class="InDesign"><table><tr><td class="banner">InDesign CS4</td><td class="pod"><img src="images/PDF.gif" width="16" height="16" hspace="15" valign="50%" />&#160;&#160;
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                <h1>
                    How tags affect reuse and accessibility
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                <div><p>The
content of an Adobe PDF document can be reused for other purposes.
For example, you might create an Adobe PDF file of a report with
text, tables, and images, and then use various formats to distribute
it: for printing or reading on a full-sized monitor, for viewing
on a handheld device, for reading out loud by a screen reader, and
for direct access through a web browser as HTML pages. The ease
and reliability with which you can reuse the content depends on
the underlying logical structure of the document.</p>
<p>To make sure that your Adobe PDF documents can be reused and
accessed reliably, you must add tags to them. Tagging adds an underlying
organizational structure, or <dfn class="term">logical structure tree</dfn>,
to the document. The logical structure tree refers to the organization
of the document’s content, such as title page, chapters, sections,
and subsection. It can indicate the precise reading order and improve navigation—particularly
for longer, more complex documents—without changing the appearance
of the PDF document. </p>
<p>For people who are not able to see or decode the visual appearance
of documents, assistive technology can access the content of the
document reliably by using the logical structure tree. Most assistive
technology depends on this structure to convey the meaning of content
and images in an alternative format, such as sound. In an untagged
document, no such structure exists, and Acrobat must infer a structure
based on the reading order choices in the preferences. This method
is unreliable and often results in page items read in the wrong
order or not read at all.</p>
<p>The tags appear
on the Tags tab in Acrobat&#160;6.0 and later, where they are
nested according to the relationship definitions for the tagged
elements. You cannot edit tags in Acrobat Standard. If your work
requires you to work directly with tags, you should upgrade to Acrobat&#160;9
Professional. For more information, see Acrobat Help.</p>
<div class="fignone"><img alt="" id="xc_02" src="images/xc_02.png" /><div class="figdesc">Logical structure tree on the Tags tab in Acrobat&#160;9</div><br /></div><div class="note"><span class="notetitle">Note:  </span>Tags used in Adobe PDF files can be compared
to tags in HTML and XML files. To learn more about basic tagging
concepts, see any of the many references and text books available
in bookstores, in libraries, and on the Internet.</div>
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