Gdome is the Gnome DOM engine, and aims to provide compatibility with all of DOM2, and some of DOM3 XPath. It's being used in Gill. It is based on libxml2.
This project has the following developers:
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!