Here's a short guide to the Tag set for accessible PDFs, per the PDF/UA-1 accessibility standard.
< Document >
At the top of the tag tree; contains everything in the PDF file.
< Part >
Contains a large major section of the document, such as a chapter of a book.
< Art >
An article or distinct portion of the PDF.
< Sect >
A small section of a larger article or part, such as a sidebar, pull quote, or boxed text.
< Div >
Not recommended, does not convey semantics.
< H1 >
Heading 1 is used to label the title of the document or a major section. Avoid using for subheads.
< H2 > – < H6 >
Lower-level headings, subheads.
< H >
Not recommended, is not well defined.
< P >
The most often-used tag, for body text.
< BlockQuote >
Used to label a full paragraph as an extract or quote attributed to someone else or another publication.
< Caption >
Used for figure and table captions.
< Index >
Identifies an entry in an index.
< L >
(List) A combination of tags that label and identify the individual parts of a list. Includes: < L >, < LI >, < Lbl >, and < LBody >.
< Note >
The text of a footnote, endnote, or source note.
< TOC >
(Table of Contents) A combination of tags that identify a TOC and its individual elements. Includes: < TOC > and < TOCI >.
< BibEntry >
An entry in a bibliography.
< Code >
Text that represents computer program text or coding.
< Formula >
A mathematical formula or equation.
< Link >
A combination of tags that surrounds an active, clickable hyperlink. Includes: < Link > and < Link-OBJR >.
< Quote >
Short quoted material within a sentence, usually surrounded by “quote marks.”
< Reference >
A citation to text or a figure that appears elsewhere in the document; a cross-reference; or a superscript footnote number.
< Span >
Used by software to designate visual formatting, discretionary hyphens, etc.
< Table >
A combination of tags labeling the entire table and its individual components. Includes: < Table >, < TR >, < TH >, and < TD >. The < THead >, < TBody >, and < TFoot > tags are optional at this time.
< Form >
An individual form field that is interactive.
< Figure >
Any graphic element, such as an illustration, photograph, graphical chart, logo, or other element that is not text. Also scanned text that has not been converted to live text (OCR), or graphical text.
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