Description of the illustration plsql_trigger_source
[schema.] trigger_name [ sharing_clause ] [ default_collation_clause ] { simple_dml_trigger | instead_of_dml_trigger | compound_dml_trigger | system_trigger }
[schema.] trigger_name [ sharing_clause ] [ default_collation_clause ] { simple_dml_trigger | instead_of_dml_trigger | compound_dml_trigger | system_trigger }