xml using if-then-else in tags

1.
<?if:NATIONALITY_CODE  =101?>
Text to Display
<?end if?>


2.
<?choose:?>
<?when: CF_P_GROUP_BY =0?>
your table to excecute.
<?end when?>

<?when: CF_P_GROUP_BY =3?>
your table to excecute.
<?split-by-page-break?>
<?end when?>
<?end choose?>