private function sortXML (array $sort) {
		// On no count, no need to sort
		if (count($sort) == 0) {
			return '';
		}

		$queryString = '';
		foreach ($sort as $col => $value) {
			$queryString .= '<FieldRef Name="' . $col . '" Ascending="' . $this->getSortFromValue($value) . '" />';
		}
		return '<OrderBy>' . $queryString . '</OrderBy>';
	}