External Pages’ Sitemap Multiple URLs

add_filter('bwp_gxs_external_pages', 'my_external_sitemap');

function my_external_sitemap()
{
	$external_pages = array(
		array('location' => home_url('link-to-page.html'), 'lastmod' => '06/02/2011', 'priority' => '1.0'),
		array('location' => home_url('another-page.html'), 'lastmod' => '05/02/2011', 'priority' => '0.8')
		// repeat this for any other pages you would like to add
	);
	return $external_pages;
}

I’m using the external pages’ sitemap feature, so far I managed to implement it exactly as that. Thanks to the tutorial found here: http://betterwp.net/wordpress-plugins/google-xml-sitemaps/#external_sitemap

However this is my problem: I would be needing to add tens of thousands of URLs, which would mean I would have tens of thousands of extra lines on my functions.php – which would be a problem (functions.php’s filesize would be too huge)

Is there a workaround it?

http://wordpress.org/plugins/bwp-google-xml-sitemaps/