Reply to: Nesting unordered lists?April 26, 2009 at 8:10 pm
There is a DITA forum for DITA questions …
The sublists are allowed as children of the list item li, not as direct childs of the list elements ul or ol. That's the way it is, don't ask me why. Yahoo group dita-users is a better place to ask generic DITA questions.
You can click with right mouse button on any element or text in XMetaL and select “Help On Current Element” – a very neat feature of XMetaL. There you can read that ul only allows li as child but li allows ul.