mostrar un php con xml implica domxml_extensiones en el servidor?

[worldPeace_Plis]

en el servidor estan estas extensiones

Array
(
[0] => zip
[1] => xslt
[2] => xmlrpc
[3] => xml
[4] => wddx
[5] => tokenizer
[6] => sysvshm
[7] => sysvsem
[8] => sysvmsg
[9] => standard
[10] => sockets
[11] => snmp
[12] => shmop
[13] => session
[14] => pspell
[15] => posix
[16] => pdf
[17] => overload
[18] => odbc
[19] => mysql
[20] => mime_magic
[21] => mhash
[22] => mcrypt
[23] => mcal
[24] => mbstring
[25] => ldap
[26] => imap
[27] => iconv
[28] => gmp
[29] => gettext
[30] => gd
[31] => ftp
[32] => fribidi
[33] => exif
[34] => domxml
[35] => dbx
[36] => dba
[37] => curl
[38] => ctype
[39] => crack
[40] => calendar
[41] => bz2
[42] => bcmath
[43] => zlib
[44] => pcre
[45] => openssl
[46] => Zend Optimizer


http://www.aescenateatro.net/pruebas/php_xml.php me subi un archivo de prueba y parece que si lee el xml. Ahora mi pregunta, porque si lo lee, necesito una asesoria de q realmente se necesita para leer los xml a cuales son las funciones para leerlos con php

Gracias