Abstract
An XML document D often has a regular structure, i.e., it is composed of many similarly named and structured subtrees. Therefore, the entropy of a trees structuredness should be relatively low and thus the trees should be highly compressible by transforming them to an intermediate form. In general, this idea is used in permutation based XML-conscious compressors. An example of such a compressor is called XSAQCT, where the compressible form is called an annotated tree. While XSAQCT proved to be useful for various applications, it was never shown that it is a lossless compressor. This paper provides the formal background for the definition of an annotated tree, and a formal proof that the compression is lossless. It also shows properties of annotated trees that are useful for various applications, and discusses a measure of compressibility using this approach, followed by the experimental results showing compressibility of annotated trees.
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Notes
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gzip -9 FILE.
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xz -9 -e FILE.
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bzip2 -9 FILE.
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ppmonstr -m1700 -o64 FILE.
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zpaq add FILE.zpaq FILE -method 69 -noattributes.
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paq8pxd_v7 -8 FILE.
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Acknowledgements
The work of the first and third authors are partially supported by the NSERC RGPIN grant and NSERC CSG-M (Canada Graduate Scholarship-Masters) grant respectively.
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Müldner, T., Miziołek, J.K., Corbin, T. (2015). Permutation Based XML Compression. In: Monfort, V., Krempels, KH. (eds) Web Information Systems and Technologies. WEBIST 2014. Lecture Notes in Business Information Processing, vol 226. Springer, Cham. https://doi.org/10.1007/978-3-319-27030-2_5
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