MessageBundles classes extend this class, to implement a bundle.
For Native Language Support (NLS), system of software internationalization.
This interface is similar to the NLS class in eclipse.osgi.util.NLS class -
initializeMessages() method resets the values of all static strings, should
only be called by classes that extend from NLS (see TestMessages.java for
reference) - performs validation of all message in a bundle, at class load
time - performs per message validation at runtime - see NLSTest.java for
MessageBundle classes may subclass this type.