Term: CHAR_BASE

Definition:
There are several occurrences of CHAR_BASE in the SQL code for the 11g database, but any attempt to use them raises the following error:

PLS-00504: type CHAR_BASE may not be used outside of package STANDARD

This appears to be an undocumented language feature of PL/SQL that is present but not enabled for use in the standard PL/SQL code distribution. References to it can be found in lines similar to the following:

type MLSLABEL is new CHAR_BASE;