TODO (for v4): 1. Auto parse -> update errors 2. Design/Undo/Redo -> update errors 3. Jump to XmlNode (position tracking required) git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@3441 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61