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Elliotte Rusty Harold wrote: > I expect any plausible binary compression scheme to be lossless with > respect to the infoset, not the PSVI mind you but the I. I don't > expect to lose any significant data just because: > > 1. The data is invalid > 2. I happen to use a different schema for decoding than you used for > encoding > > If the binary compression fails these tests, I cry shenanigans on you. > :-) For an example of encoding XML documents without loss of data you can see my old XMLS project at http://www.sosnoski.com/opensrc/xmls/index.html This is designed for serialization/deserialization speed rather than maximum compression. Even so, it reduced sizes by about 40% overall for the set of documents I used in testing. It also ran several times faster than text for going to and from dom4j and JDOM document models. I didn't actually compare parsing speed directly (this was originally intended as an alternative to Java serialization for moving document models over the wire, not as a general-purpose XML transport), but I'd suspect it's at least twice as fast as any parser. In answer to your earlier email about actual results, the page at http://www.sosnoski.com/opensrc/xmls/results.html gives full benchmark information. I've thought about extending this to full Infoset compatibility, and while I'm at it there are still a few optimizations I can make for faster handling of character data content. Don't know when/if I'll ever get back to it as things sit right now, but if anyone is interested let me know. - Dennis
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