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About structure

For Adobe PDF files to be flexible and accessible they must have structure, and Adobe PDF files support three levels of structure—tagged, structured, and unstructured. Tagged PDF files have the most structure. Structured PDF files have some structure, but are not as flexible or accessible as tagged PDF files. Unstructured PDF files have no structure. As you will see later in this lesson though, you can add limited structure to unstructured files. The more structure a file has, the more efficiently and reliably its content can be reused.

Structure is built-in to a document when the creator of the document defines headers, columns, adds navigation aids such as bookmarks, and adds alternative text descriptions for graphics, for example. In many cases, documents are automatically given logical structure and tags when they are converted to Adobe PDF. (PDF files created with earlier versions of Acrobat may not have structure.) The best way to create a structured, reusable PDF document is to create a well-structured document in your original authoring application.


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