EDIT

<?php

/**

 * Implements hook_menu().

 */

function dwca_export_menu() {

	$items = array();

	$items['admin/config/system/dwca_export/settings'] = array(

		'title' => t('DarwinCore-Archive export'),

		'page callback' => 'drupal_get_form',

		'page arguments' => array('dwca_export_config_form'),

		'access arguments' => array('access administration pages'),

		'type' => MENU_LOCAL_TASK,

		//'file' => 'dwca_export.admin.inc'

	);

	$items['dwca_export'] = array(

		'page callback' => 'dwca_export_deliver_archive',

		'access arguments' => TRUE,

		'type' => MENU_CALLBACK

	);

	return $items;

}

/**

 * Form function, called by drupal_get_form()

 * in dwca_export_menu().

 */

function dwca_export_config_form($form, &$form_state) {

	$form['dwca_export_todo'] = array(

		'#markup' => '<p>No settings implemented yet.</p>'

	);

	return system_settings_form($form);

}

/**

 * menu callback

 */

function dwca_export_deliver_archive() {

	$tmp_archive_file_name = dwca_export_create_archive( _get_views_map() );

	// 1. http://api.drupal.org/api/drupal/includes--file.inc/function/file_copy/7

	// 2. file_transfer($tmp_archive_file_name, $headers)

	print "TODO export";

}

/**

 * Walks all view export paths defined in the $views_map.

 * Each file is downloaded to the tmp folder and a zip file

 * is bundeled of the resulting csv files plus the meta file.

 *

 * @param - $views_map maps a view paths to dwca filenames

 *

 * @return the path in the filesystem to the final archive

 */

function dwca_export_create_archive($views_map) {

	$tmp_archive_file_name = drupal_tempnam(file_directory_temp(), "dwca_export_");

	return $tmp_archive_file_name;

}

/**

 * provides the settings which map a view path to

 * a dwca filename.

 *

 */

function _get_views_map() {

	return array(

		'taxon' => 'taxon.txt',

		'extension' => 'extension.txt'

	);

}