use these prefixed token names, although the grammar itself still
uses the short names (as in the sample rule given above).
+** Variable api.namespace
+
+ The "namespace" variable is renamed "api.namespace". Backward
+ compatibility is ensured, but upgrading is recommended.
+
* Changes in version 2.5 (????-??-??):
** IELR(1) and Canonical LR(1) Support