d CDI beans are available to that expression, as well as the default classes as specified by
 Expression Language 3.0 for the <code>ELProcessor</code>.
 
 <p>
 Expressions can be either immediate (<code>${}</code> syntax), or deferred (<code>#{}</code> syntax). Immediate
 expressions are evaluated once when the bean instance corresponding to the "...Definition" annotation is actually
 created. Since such beans are application scoped, that means once for the entire application. Deferred expressions
 are eval