Syntax:     bf(%token-namespace) tt(namespace) 

This directive is only processed when the tt(token-path) directive or option
has also been specified. 

tt(Namespace) defines the namespace of the class containing the tt(Tokens_)
enumeration.  By default no namespace is used. The namespace defined here can
independently be specified from the Parser's namespace (specified by the
tt(namespace) directive or option).
