public function export(Source $dataSource, array $options = array()) {
		$defaults = array('keys' => array());
		$options += $defaults;

		$keys = $options['keys'] ?: array_keys($this->_config);
		$methods = $dataSource->methods();
		$results = array('type' => $this->_type);

		$apply = array_intersect($keys, $methods);
		$copy = array_diff($keys, $apply);

		foreach ($apply as $item) {
			$results[$item] = $dataSource->{$item}($this->{$item}(), $this);
		}
		foreach ($copy as $item) {
			if (in_array($item, $keys)) {
				$results[$item] = $this->_config[$item];
			}
		}
		if (in_array('data', $keys)) {
			$results['data'] = $this->_exportData();
		}
		if (isset($results['source'])) {
			$results['source'] = $dataSource->name($results['source']);
		}
		if (!isset($results['fields'])) {
			return $results;
		}
		$created = array('fields', 'values');

		if (is_array($results['fields']) && array_keys($results['fields']) == $created) {
			$results = $results['fields'] + $results;
		}
		return $results;
	}