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';
?>