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I do not think XDXF would work well because it is a single file. Russian-English dictionary is 100 meg XML file: loading that in handheld memory would be challenging. So, at a minimum, single XML needs to be broken into pieces. Also, it is not an issue how to represent the content: it can be done either by CSS-styled XDXF snippets or CSS-styled XHTML with classes. This part is OK, no changes to the standard are required. The issue is how to build an index that can quickly guide reading system to the appropriate part of the content. Note that a single index file won't cut it - it will likely be too large. Some sort of hierarchical structure broken between several files is needed. That, I think, is an extension to EPUB that needs to be defined (or borrowed).
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