I don't think it is the ePub CFI. It is what Adobe uses for their locations in ADE and the RMSDK. It might be what the ePub CFI is based on.
@Gergely: And it is the same format I described the other day. Kobo's epub reader is based on the Adobe RMSDK and uses these in the bookmark table for epubs and PDFs. I haven't found an official definition, but I also haven't looked very hard.
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