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2. PDF/UA - Wikipedia

   en.wikipedia.org/wiki/PDF/UA

   PDF/UA (PDF/Universal Accessibility), [1] formally ISO 14289, is an International Organization for Standardization (ISO) standard for accessible PDF technology. A technical specification intended for developers implementing PDF writing and processing software, PDF/UA provides definitive terms and requirements for accessibility in PDF documents and applications. [2]

3. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   Google Chrome: Includes a PDF viewer. GSview: Open source software and Ghostscript's viewer for Windows. Microsoft Edge: Includes a PDF viewer. Microsoft Reader: A discontinued PDF viewer in Windows 8.1. Mozilla Firefox: Includes a PDF viewer. MuPDF: Free lightweight document viewer. Nitro PDF Reader: Freeware (though proprietary) PDF reader ...

4. Unicode Consortium - Wikipedia

   en.wikipedia.org/wiki/Unicode_Consortium

   The Unicode Consortium (legally Unicode, Inc.) is a 501(c)(3) non-profit organization incorporated and based in Mountain View, California, U.S. [4] Its primary purpose is to maintain and publish the Unicode Standard which was developed with the intention of replacing existing character encoding schemes that are limited in size and scope, and are incompatible with multilingual environments.

5. Universal Coded Character Set - Wikipedia

   en.wikipedia.org/wiki/Universal_Coded_Character_Set

   The Universal Coded Character Set (UCS, Unicode) is a standard set of characters defined by the international standard ISO/IEC 10646, Information technology — Universal Coded Character Set (UCS) (plus amendments to that standard), which is the basis of many character encodings, improving as characters from previously unrepresented typing systems are added.

6. STDU Viewer - Wikipedia

   en.wikipedia.org/wiki/STDU_Viewer

   The first STDU Viewer was version 1.0.60, released on 13 September 2007. It supported three formats: PDF (including hyperlinks embedded), DjVu, and Tagged Image File Format (TIFF). Version 1.0.76 introduced Unicode character support. Version 1.4.7 introduced the Print document function.

7. Unicode compatibility characters - Wikipedia

   en.wikipedia.org/wiki/Unicode_compatibility...

   In order to dispense with these compatibility characters, text software must conform to several Unicode protocols. The software must be able to: Compose diacritic marked graphemes from letter characters and one or more separate combining diacritic marks. Substitute (at the author or reader's discretion) ligatures and contextual glyph variants.