Free Tool for Efficient XML Data Compression
We would like to announce the release of XMill, a compressor for XML data. XMill typically compresses twice as good as gzip, at about the same speed. XMill is written in C++, and its distribution site is: http://www.research.att.com/sw/tools/xmill TECHNICAL SUMMARY. The idea in XMill is that XML data items are grouped according to their tags, then each group is compressed separately with gzip. This is XMill's default behavior, and already results in better compression than gzip. Furthermore, users can select particular semantic compressors (such as for integers, IP addresses, state names, ...) to be applied to certain data items, or can override the way data items are grouped: this further improves the compression rate. In complex applications where XML files contain highly specialized datatypes, such as images or DNA sequences, XMill can be extended with user-defined compressors for those data types. XMill defines a C++ Semantic Compressor API (SCAPI) for such extensions. PAPER. A technical paper describing XMill is included in the distribution package, and is also available directly from: http://www.cis.upenn.edu/~liefke/papers/xmill.ps.gz HIGHLIGHT. It is known that XML files tend to be larger than files in application specific data formats. With XMill however, it becomes more economical to choose XML over application specific data formats, because the XML file is compressed with XMill better (up to half the size) than the application specific file compressed with gzip. We discovered this surprising fact by converting several application specific data formats to XML (including weblog data, protein meta data, linguistic data), then compressing the original file with gzip, and the XML file with XMill: the compressed XML file was always smaller, up to a factor of two. Details are included in the distribution at the Web site above. MAILING LIST. For updates on XMill, please subscribe to xmill@r..., by sending an email to majordomo@r..., with the body "subscribe xmill". Regards, Hartmut Liefke -- University of Pennsylvania, liefke@s... Dan Suciu -- AT&T Labs, suciu@r... xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To unsubscribe, mailto:majordomo@i... the following message; unsubscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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