InDesign CS5.5 introduced the Articles panel, which makes tagging PDF documents easier than ever — you no longer have to use the Structure pane or Tags panel.
Now you can easily map styles to PDF tags. When InDesign exports the tagged PDF, those mapped tags automatically define the role map in Acrobat.
Articles provide designers and production artists an easy way to create relationships among page items. These relationships define the content to be used while exporting to ePub, HTML, or accessible PDFs, and define the order of the content.
You can create articles from a combination of existing page items within a layout, including images, graphics, or text. Once an article has been created, page items can be added, removed, or reordered. While articles can be created manually by dragging one or more page items to an article in the Articles panel, there are also mechanisms for adding bulk content to an article, including adding all selected content to an article or adding an entire document to an article.
The Articles panel is designed to be simpler and easier to use for people without XML skills. Note that the ability to use the XML Structure panel has not been removed; it is now an additional option that complements the use of the Articles panel during the export process.