how to run DBMS_RULE_ADM Oracle 11.2.0.3

My instructions are 

DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(DBMS_RULE_ADM.CREATE_RULE_OBJ, '&lt;schema_name&gt;');


I tried to run them at sqlplus /as sysdba

but it tells me unknown command beginning DBMS_RULE

Is there a different way to run these?
You need to use EXEC[UTE] or BEGIN ... END ;.

EXEC DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(DBMS_RULE_ADM.CREATE_RULE_OBJ, '');


Or:

BEGIN
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(DBMS_RULE_ADM.CREATE_RULE_OBJ, '');
END;
/