A simple read-only PHP front-end is included which can easily be integrated into an existing web site (or framework).
To get started, just take a look at sodp.php and odp_db.php.
To get nice-looking URLs you might want to add the following lines to your .htaccess:
RewriteRule ^odp/(.*) sodp.php/$1 RewriteRule ^odp$ /odp/ [R=permanent]
BTW, just have a look at cmeerw.org/odp/ to see how this can be integrated into a web site.