Chess Markup LanguageChessML defines a data storage format which preserves all abstract information; an important example is the PDB database developed by Gerd Wilts and others. It builds an interface to chess problem software such as Popeye, Alybadix, Natch and others, develops a flexible format providing simple export functions to LaTeX, HTML, PDF, RTF and others, provides simple interfaces for the data conversation between this hypothetical standard and other chess standard such as PGN and FEN. The ChessML web site provides a working draft specification for ChessML, with four XML DTDs, documentation, examples, and FAQ document. The ChessML sources, example and the documentation files are distributed under the Gnu Public License.(Definition adapted from a news at xml.coverpages.org)
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