{ SCOPE FOR ( { ref_column | ref_attribute } ) 
  IS [schema .] scope_table_name 
| REF ( { ref_column | ref_attribute } ) WITH ROWID
| [CONSTRAINT constraint_name] FOREIGN KEY 
  ( { ref_column | ref_attribute } ) references_clause
}

For information on the symbols and conventions of Backus-Naur Form (BNF) syntax, see Appendix A.