This is the first milestone that uses the new namespace org.eclipse.vex,
which means, an update from an older version of Vex will not work and it
will break your vex-plugin.xml files. So please be aware to do a fresh
install of Vex and to do some find-and-replace in your vex-plugin.xml files.
The other two main features of this milestone are a better support of
XML namespaces with the ability to edit the namespace declarations of
each element and the basic support of XML schema. Please see the new and
noteworthy for more detailed information about the new features: