tk - thanks for the articles! I'll get back to you - I've read a few articles about LSA's success in essay scoring and could do with a decent rebuttal.
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!