PDF/UA
PDF/UA (PDF/Universal Accessibility) is a way of creating accessible PDF documents. Accessible PDF documents do not only offer advantages for people with impaired vision, but also create the prerequisite for texts to flow around objects correctly and thus be output correctly on small output devices. PDF/UA documents have the following properties: PDF/UA markup (version specification), dc:title entry in the metadata, the semantic structure of the document must be specified (Tagged PDF), the language of the document must be specified as well as any different languages for individual text passages, alternative descriptions must be available for all non-textual content of the document, e.g. images, the long forms of all abbreviations must be specified, labeled artifacts, no use of visual aids such as flashing or flickering, no exclusive use of contrasts, color or layout to convey information, embedded fonts.
