As of December 15, 2006 the XDXF project repository contains 615 dictionaries, which are collectively 936,189,613 bytes in size (compressed) and contain 24,804,355 articles.
The XDXF file format is used by Alpus, SimpleDict and GoldenDict.
[1] Also StarDict starting with version 2.4.6 has basic support for XDXF.
Many languages serve a similar purpose, e.g., the Lexical Markup Framework (XML and other serializations), OntoLex (RDF), DICT (text format), or the dicML markup languages.
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