The real technical content of the CDF recommendations is in details of how to glue these various (XML markup) languages together once they all have been processed into their respective DOMs. It establishes conventions for how a script might reach across DOM boundaries, how events might get propagated across DOM boundaries and stuff like that. I won't go into this any deeper because you will get more accurate information by just reading the W3C
documents. But the main idea of CDF is to bring these variously defined content types into a uniform "framework" so that scripts can operate more at a document level instead of being confined to their own document child.
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