code: func VoidIn(db XODB, v0 pgtypes.Cstring) error {
  	var err error
  
  	// sql query
  	const sqlstr = `SELECT pg_catalog.void_in($1)`
  
  	// run query
  	XOLog(sqlstr)
  	_, err = db.Exec(sqlstr)
  	return err
  }
docs: // VoidIn calls the stored procedure 'pg_catalog.void_in(cstring) void' on db.