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DVI or Portable Document Format (PDF) converter Texinfo: 1986 Richard Stallman: Text editor: output to DVI, Portable Document Format (PDF), HTML, DocBook, others. TeXmacs format: 1998 Joris van der Hoeven: Text editor/TeXmacs editor: PDF or PostScript files. Converters exist for TeX/LaTeX and XHTML+Mathml: Textile: 2002 [3] Dean Allen Text editor
Page description languages such as PostScript and PDF have become the de facto standard for documents that a typical user should only be able to create and read, not edit. In 2001, a series of ISO / IEC standards for PDF began to be published, including the specification for PDF itself, ISO-32000 .
In contrast, a character entity reference refers to a character by the name of an entity which has the desired character as its replacement text. The entity must either be predefined (built into the markup language) or explicitly declared in a Document Type Definition (DTD). The format is the same as for any entity reference: &name;
ISO 639 is a standardized nomenclature used to classify languages. [1] Each language is assigned a two-letter (set 1) and three-letter lowercase abbreviation (sets 2–5). [ 2 ] Part 1 of the standard, ISO 639-1 defines the two-letter codes, and Part 3 (2007), ISO 639-3 , defines the three-letter codes, aiming to cover all known natural ...