Php 5.2.1 xslt problem

Hi all,
I have come across a problem with my web hosts php configuration.
I have a cms that I have built that relies on the xslt processor class yet there installation of php 5.2.1 does not seem to have it installed.
I have spoke to the server administrators and they insist all php capabilities are enabled and am having trouble finding an explanation on-line apart from a few forum entries recognising a problem.
I do not understand this as on my local testing server I have php 5.0.4 installed and works fine. Is there another approach in this later version of php that I cant find documentation for?. Can anyone please advise on a resolution to this problem,
Regards
Gary Law