HTML doc check in PHP? How to?

Hi, I would like to be able to check html documents against a "template html document" using PHP. In the example below I would like to check if the document starts with a <h1> + string + </h1>, and is followed by a <h1> + "version" + ... etc. etc. Should/could I use XML? Any ideas would be greatly appreciated! <center> <h1>DataSelect Installation and Configuration</h1> <h3>version 1.0 - Dec 20th, 2001 (dsl/d0001v10)</h3> by Simon.de.Kraa (Simon.de.Kraa@icl.nl) </center> <h2>Table of content</h2> <ul> <li><a href="#introduction">Introduction</a> <li><a href="#installation">Installation</a> <li><a href="#configuration">Configuration</a> <ul> <li><a href="#dataselect_objects">DataSelect Objects</a> <li><a href="#dataselect">DataSelect</a> </ul> </ul> <!-- --- INTRODUCTION --- --> <h2><a name=introduction>Introduction</a></h2> This document describes the complete process of installing and configuring DataSelect. <!-- --- INSTALLATION --- --> <h2><a name=installation>Installation</a></h2> ... <!-- --- CONFIGURATION --- --> <h2><a name=configuration>Configuration</a></h2> <h3><a name=dataselect_objects>DataSelect Objects</a></h3> ... <h3><a name=dataselect>DataSelect</a></h3> ... Met vriendelijke groet / With kind regards, ICL Nederland B.V. Simon de Kraa e-Applications / Logistic Systems Systems Architect Het Kwadrant 1 Tel. +31 346 598865 Postbus 4000 Fax +31 346 562703 3600 KA MAARSSEN The Netherlands mailto:Simon.de.Kraa@icl.nl --- Progress 9.1c, Roundtable 9.1c, NuSphere Pro Advantage 2.3.1 @ MS Windows 2000 5.00.2195 SP 2 Progress 9.1c @ SCO UnixWare 7.1.1