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There is communication capability planned in ePub 3. Our wiki has a few details but the specification seems not to be fully flushed out yet. ipdf site has more details. ePub 3 will have add on modules of capabilities. our wiki has this statement.
ePubCFI is a newly defined linking scheme. It provides for a method of linking to a location inside an ePub from somewhere outside the document. It requires specific knowledge of the content. It makes use of id's defined in the document as well as counting of locations. It needs knowledge of the code view.
Dale
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