code: @InternalFunction(precedence=1,isAssign=true)
      public void activate(RuleContext ruleContext,RuleProxyField ruleProxyField)
      {
          setActivate(ruleProxyField,ruleContext);
      }
docs: /* (non-Javadoc)
  @see nz.co.senanque.rules.RuleSession#activate(nz.co.senanque.rules.RuleContext, nz.co.senanque.validationengine.ProxyField)