Extensible Data Format
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- This article is about XDF, the markup language standard. XDF can also mean IBM XDF, the floppy diskette format.
The Extensible Data Format (XDF) is an XML standard (consisting of a DTD and inheriting XML) developed by NASA, meant to be used throughout scientific disciplines. In many ways it is akin to XSIL, Extensible Scientific Interchange Language. NASA provides two XDF APIs, in Perl and in Java.