6 domains in one?

Hello,

I have 6 domains pointing to the same hosting account, root directory.

I would like 7 pages (obviously the same) but from each domain to be on
a sitemap, or on more than one sitemaps.

I have tried adding the 7 links x 6 Url's into one sitemap, and it
gives me errors to "verify".

e.g.:

http://page.com/1.htm
http://page.com/2.htm
http://page.com/3.htm
http://page.com/4.htm
http://page.com/5.htm
http://page.com/6.htm
http://page.com/7.htm
http://page.net/1.htm
http://page.net/2.htm
http://page.net/3.htm
...
...

What should I do to add 7 links from 6 different domains which all
point into the same place (folder) ?

I cannot have more than one "sitemap.xml" per folder, can I?

Thanks,

Will.