The installation instructions for all the SDO components
   are in the SDO 
   install
   section of the SDO documentation.
  
  
   In any case, the essential facts are that 
   the Relational DAS is written in PHP and it 
   should be placed somewhere on the PHP
   include_path.
  
  
   Your application will of course need to include the Relational DAS 
   with a statement like this:
   
<?php
require_once 'SDO/DAS/Relational.php';
?>