Extensible Binary Meta Language
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Extensible Binary Meta Language, or EBML, is a generalized file format for (theoretically) any kind of data, aiming to be a binary equivalent to XML. Since the DTD of the extended format must be available to a decoder to allow reading of the data, it is not extensible in the same way that XML is; unlike XML, a DTD of a previous version, or no DTD, is not useful.
It was originally developed for the Matroska audio/video container format.