$this->dieContinueUsageIf( strval( $ns ) !== $cont[0] );
$title = $db->addQuotes( $cont[1] );
$this->addWhere( "ar_namespace $op $ns OR " .
"(ar_namespace = $ns AND ar_title $op= $title)" );
} elseif ( $mode == 'all' ) {
$this->dieContinueUsageIf( count( $cont ) != 4 );
$this->dieContinueUsageIf( strval( $ns ) !== $cont[0] );
$title = $db->addQuotes( $cont[1] );
$this->addWhere( "ar_namespace $op $ns OR " .
"(ar_namespace = $ns AND ar_title $op= $title)" );
} elseif ( $mode == 'all' ) {
$this->dieContinueUsageIf( count( $cont ) != 4 );