private function initCollections()
{
$this->source = new fDOMDocument();
$this->source->load($this->xmlDir . '/source.xml');
$this->source->registerNamespace('phpdox', 'http://xml.phpdox.net/src');
$this->index = new fDOMDocument();
$this->index->load($this->xmlDir . '/index.xml');
$this->index->registerNamespace('phpdox', 'http://xml.phpdox.net/src');
}