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:

• word alphabet can consist of start tags (like '<tag>'), urls, e-mails
• special model for numbers encoding
• input XML file is split into containers
• there are special containers for dates, time, pages and fractional numbers
• end tags ('</tag>') are replaced with a single char
• end tags + EOL symbols can also be replaced with a single char
• spaceless words model
• very effective methods for white-space preserving
• quotes modeling ('="' and '">' replaced with a single char)

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.)