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I am aware of a few research projects that used a binary representation of XML. I think the main things with binary XML are compressed data exchange and storage and I think they reported faster processing than ordinary DOM. I shall list the 3 that I have heard of. The last I heard of them was almost a year ago. 1. PDOM - Persistent DOM - They do not do any extra compression other than the compression due to binarization. The main point here is the DOM is not fully memory resident - it does partial loading. 2. Millau - They separate structure and content and do compression. Mainly it is for exchange, and I think they also got to a very primitive DOM support. This was in WWW9, and was a research project at IBM. 3. XMill - This is from AT & T and University of Pennsylvania. I think this achieved the most compression. Idea was similar to Millau's but in addition, for values they used something called "column-based compression" -- I think compression and decompression overhead as well as header overhead is larger here. I also think the space and time savings by the different projects were something like: Millau - claimed storage decreased 5 times. also claimed something like 20% savings in processing the DOM. (recollections). XMill - claimed storage decreased only for large documents - documents should be at least 64 kB (recollections). But I am sure Millau claimed storage and processing got better. regards - murali. On Tue, 10 Apr 2001, Al Snell wrote: > On Tue, 10 Apr 2001, Tim Bray wrote: > > > So, Sean may have used strong language, but in point of fact > > he was correct, so it's forgivable. Get some data on how > > much space and time a binary representation will save, then > > you'll be able to make intelligent quantitative decisions > > on where it's worthwhile deploying it.
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