[Plugin: Google XML Sitemaps] Rebuilding sitemap via another plugin

Is it possible to trigger the sitemap to be rebuild via another plugin?

My own plugin creates some custom pages that are outside of the main WordPress table structure. I have successfully hooking into XML Google Sitemaps to add these pages to the xml sitemap that is outputted.

Is there a way for me to trigger the sitemap to be rebuilt automatically when content has been changed in my plugin? I haven’t tested this but I’m guessing something like this should work but just want to check this is the best way?

if ( class_exists('GoogleSitemapGenerator') ) {
	$gs = GoogleSitemapGenerator::GetInstance();
	$gs->BuildSitemap();
}