<?php
$feed = new ezcFeed( 'rss2' );

$category = $feed->add( 'category' );
$category->term = 'Feed category 1';
$category->scheme = "Category domain 1";

$category = $feed->add( 'category' );
$category->term = 'Feed category 2';
$category->scheme = "Category domain 2";

return $feed;
?>