From the website:
XDXF is a project to unite all existing open dictionaries and provide both users and developers with universal XML-based format, convertible to and from other popular dictionary formats.
There are currently 308 dictionary files in various languages.
It appears dictionary files are in XML.
The SourceForge XDXF project page says material is available under GPL.
Dictionaries are available on the download page.
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XDXF - XML Dictionary Exchange Format. No author.
Retrieved 23:41, May 21, 2013 (UTC).
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