Integration with other sitemaps on same site

I am planning on having three programs integrated on my website soon:

Wordpress
Joomla
and
vBulletin.

Each one of these apps has a way to create sitemaps for their respective programs:

Wordpress:
Google (XML) Sitemaps Generator for WordPress

Joomla (one of about4):
http://extensions.joomla.org/extensi.../site-map/3066

and your tool.

My concern is that they will all "overwrite" each other.

Do you know if (at least) your program will know where to update, and not overwrite the whole sitemaps file?

Hello Jeremy,

Thanks for your interest in our products.

Since your vB sitemaps will be located in a seperate folder which is only used by our addon I think you would be safe to use it.
Further you can enter a custom location for the files so I don't see a reason why it shouldn't work.