Versions tested: 3.2
Optimal parameters: -l6 -b32 -m32
Links: http://sourceforge.n...
wrt40-eng.rar
Authors: Przemyslaw Skibinski, Igor Pavlov, Dmitry Shkarin, Matt Mahoney
Algorithms: DICT+LZ/PPM/CM
Notable peformances: -

xwrt

XWRT (XML-WRT) is a high-performance XML compressor. It transforms XML to more compressible form and uses zlib (default), LZMA, PPMVC, or lpaq 6 as back-end compressor. This idea is based on well-known XML compressor - XMill. Moreover, XML-WRT creates a semi-dynamic dictionary and replaces frequently used words with shorter codes. There are additional techniques to improve compression ratio:
the program documentation

 

March 31, 2009 the author submitted the following configurations:

a) semi-dynamic dictionary:
-l2 -b32 -m32
-l6 -b32 -m32
-l9 -b32 -m32
-l12 -b32 -m32
b) static dictionary (wrt-eng.dic in the same directory as xwrt.exe is required, please download http://www.ii.uni.wroc.pl/~inikep/research/wrt40-eng.rar):
-l2 +d -f65535 -m32
-l6 +d -f65535 -m32
-l9 +d -f65535 -m32
-l12 +d -f65535 -m3

(Have info that should be added here? E-mail.)


3.2 has verify error on Image1.

Qualified configurations
Ver Rating CPR DPR S.E. R.E. Ratio C. kB/s D. kB/s
-l2 +d -f65535 -m32
3.2 7 7 6 78 0 2.706 7251 70084
-l2 -b32 -m32
3.2 7 7 6 76 0 2.712 6971 70397
-l6 +d -f65535 -m32
3.2 85 83 125 52 10 3.846 1399 24961
-l6 -b32 -m32
3.2 85 83 126 52 10 3.848 1398 25028
Disqualified (why) configurations (with qualification ratings)
Ver Rating CPR DPR S.E. R.E. Ratio C. kB/s D. kB/s
-l12 +d -f65535 -m32
3.2 467 431 505 125 190 3.588 664 693
-l12 -b32 -m32
3.2 400 369 432 112 153 3.564 604 629
-l9 +d -f65535 -m32
3.2 689 633 748 339 118 3.263 2319 2438
-l9 -b32 -m32
3.2 verify error (img1)

Version info

3.2, tar: yes, mode: 32-bit, crc32: be0f65f6, decoder: 123 kB, tested: 2010 Apr 23
compression: xwrt.exe <args> <src>
decompression: xwrt.exe <cfile>
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