Adobe InDesign - Manual (Page 544)

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Headings and columns (top) reflow in a logical reading order (bottom).
Tag page items
You can tag text frames and graphics automatically or manually. After you tag page items, you can use the Structure pane to change the order of
your page by dragging elements to a new location within the hierarchy. If you change the order of the elements in the Structure pane, these
changes are passed on to the Adobe PDF file. The order of the elements becomes useful when the PDF file is saved from Acrobat as an HTML or
XML file. The order is also useful when you export an InDesign document for Dreamweaver (XHTML) or Digital Editions (EPUB) format.
Tag page items automatically
When you choose the Add Untagged Items command, InDesign adds tags to the Tags panel, and applies the Story and Figure tags to certain
untagged page items. The Story tag is applied to any untagged text frames, and the Figure tag is applied to any untagged graphics. You can then
manually apply other tags to sections of text. However, automatically tagging page items does not guarantee that the items will be structured
accordingly in the exported PDF file.
1. Choose Window > Utilities > Tags to display the Tags panel.
2. Choose View > Structure > Show Structure to display the Structure pane, to the left of the Document window.
3. Choose Add Untagged Items from the Structure pane menu.
Tags in the Structure pane and Tags panel
Tag page items manually
1. Choose Window > Utilities > Tags to display the Tags panel.
2. Choose View > Structure > Show Structure to display the Structure pane, to the left of the Document window.
3. Choose Add Untagged Items from the Structure pane menu.
4. Select a page item in the document.
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