OpenEXI

Open source .Net (C#) / Java implementation of the W3C Efficient XML Interchange (EXI) format specification. As a corollary to XML, EXI is an alternative, very efficient format that has all of the mechanics of XML, but is much more compact and is faster to exchange.

– README (about Nagasena EXI implemenation)
https://www.dropbox.com/s/adh83u9z1x1czv6/README.txt?dl=0

– Nagasena EXI grammar interchange format (PDF)
https://www.dropbox.com/s/etrpuchaddplq2s/EXIGram.pdf?dl=0

– Introduction to OpenEXI (PDF)
https://www.dropbox.com/s/n2545xm0jjyui2d/IntroToOpenEXI.pdf?dl=0

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