<?PI before document element?>
<!-- comment after document element-->
<?PI before document element?>
<!-- comment after document element-->
<?PI before document element?>
<!-- comment after document element-->
<?PI before document element?>
<!DOCTYPE doc
[
<!ELEMENT doc ANY>
<!ELEMENT a ANY>
<!ELEMENT b ANY>
<!ELEMENT c ANY>
]>
<doc>
<a><b><c/></b></a>
</doc>
<!-- comment after document element-->
<?PI after document element?>
<!-- comment after document element-->
<?PI after document element?>
<!-- comment after document element-->
<?PI after document element?>