A while ago I’ve blogged about the Kate’s most powerful plugins: the XML completion plugin. Thanks to Tomáš Trnka this plugin is back alive with all its features since today and compiled by default in trunk: It will be included in KDE 4.5. Yay! :) And if you need it already now for KDE 4.4, you can build Kate yourself very easily according to this howto, without touching your global KDE installation (probably interesting for KDE documentation writers!). Have fun!