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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>
                    Adding structure to PDFs
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                <div><p>When
you export to Adobe PDF with the Create Tagged PDF option selected
in the General area of the Export Adobe PDF dialog box, the exported
pages are automatically tagged with a set of structure tags that
describe the content, identifying page items such as headlines,
stories, and figures. To add additional tags or to fine-tune existing
ones before you export, you can use the Tags panel in InDesign.
The Structure pane (View&#160;&gt; Structure&#160;&gt; Show
Structure) reflects the changes.</p>
<p>You can improve the accessibility and reuse of Adobe PDF documents
by adding tags to the InDesign document before you export. If your
PDF documents don’t contain tags, Adobe Reader or Acrobat may attempt
to automatically tag the document when the user reads or reflows
it, but the results may be disappointing. If you do not get the
results you want in the exported PDF file, you can use tools in
Acrobat&#160;6.0 Professional and later to edit the structure
of tagged PDF documents. For the most advanced tools, use Acrobat&#160;9
Professional. </p>
<p>When you apply tags to a document for PDF export, the tags do
not control which content is exported to PDF, as is the case with
XML export. Instead, the tags give Acrobat more information about
the document’s structural contents.</p>
<div class="section"><h4 class="sectiontitle">Advantages of using tags</h4><p>By applying tags
to your document before exporting to PDF, you can do the following:</p>
<ul><li><p>Map InDesign paragraph style names to Acrobat tagged Adobe
PDF paragraph styles to create a reflowable PDF file for viewing
on handheld devices and other media. </p>
</li>
<li><p>Mark and hide printing artifacts, text, and images so that
they won’t appear when reflowed in Acrobat. For example, if you
tag a page item as Artifact, the page item will not be displayed
when you reflow the contents of a tagged Adobe PDF document on a
handheld device, a small display, or a monitor at a large magnification. </p>
</li>
<li><p>Add alternative text to figures so that the text can be read
aloud to the visually impaired with screen-reading software. </p>
</li>
<li><p>Replace graphic letters, such as ornate drop-caps, with readable
letters. </p>
</li>
<li><p>Provide a title for a set of articles, or group stories and
figures into articles. </p>
</li>
<li><p>Order stories and figures to establish a reading order. </p>
</li>
<li><p>Recognize tables, formatted lists, and tables of contents.
Recognize which content blocks belong to the different stories. </p>
</li>
<li><p>Include text formatting information such as Unicode values
of characters, spacing between words, and the recognition of soft
and hard hyphens.</p>
</li>
</ul>
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