XML parsing using php easy (webpage tutorial)

Just had a go at your tutorial on

http://www.kirupa.com/web/xml_php_parse_beginner.htm

Was just wondering, how would you go about looping in the PHP, if you had an XML file like:

                  [FONT=Courier New]<?xml version="1.0"?>[/FONT]

<number>
<value>1</value>
</number>

[FONT=Courier New]<?xml version=“1.0”?>[/FONT]
<number>
<value>2</value>
</number>

[FONT=Courier New]<?xml version=“1.0”?>[/FONT]
<number>
<value>3</value>
</number>
[SIZE=2] [FONT=Courier New] [/FONT] [/SIZE]

[SIZE=2] [FONT=Courier New] [/FONT] [/SIZE]

[SIZE=2][FONT=Courier New][/FONT] [FONT=Courier New] [/FONT] [/SIZE]