purge_audit_template

the purge_audit_template is not well documented.  It gives these examples:

rem   sqlplus user/password@tns_name @purge_audit_template.sql MY_WORKSPACE 
DEPLOYMENT ALL null null
rem   sqlplus user/password@tns_name @purge_audit_template.sql MY_WORKSPACE 
EXECUTION "number_task_errors > 0" null null
rem   sqlplus user/password@tns_name @purge_audit_template.sql MY_WORKSPACE 
EXECUTION DATE_RANGE TO_DATE('01-Jan-2004') SYSDATE

the 11g docs are pretty thin on the topic.  What are these things:

How is this thing used?   11g does a bunch of auditing out of the box and fills 
up the 
system tablespace as a side benefit with little guidance on the topic.  I tried 
to use
the scirpt without much understanding and get:

call owbsys.wb_rt_script_util.set_workspace('MY_WORKSPACE')
     *
ERROR at line 1:
ORA-06576: not a valid function or procedure name

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