 only limitation of this token class is that it
            must carry at least the token id of the token it represents. For more
            information about the interface a user defined token type has to expose
            please look at the Token Class reference. The library provides a default
            token type based on the <a href="http://www.benhanson.net/lexertl.html" target="_top">Lexertl</a>
            library which should be sufficient in most cases: the <code class="computeroutput"><span cl