title: What to use for XML parsing / reading in PHP4
body: <p>Unfortunatly I have to work in a older web application on a <code>PHP4</code> server;
  It now needs to parse a lot of <code>XM</code>L for calling <code>webservices (custom protocol, no SOAP/REST)</code>;</p>
  
  <p>Under <code>PHP5</code> I would use <code>SimpleXML</code> but that isn't available;
  There is <code>Dom XML</code> in <code>PHP4</code>, but it isn't default any more in <code>PHP5</code>.</p>
  
  <p>What are the other options?
  I'm looking for a solution that still works on <code>PHP5</code> once they migrate.</p>
  
  <p>A nice extra would be if the <code>XML</code> can be validated with a schema.</p>