Create a new XML Sitemap for a blog subdomain?

[iAnalyst.com]

What would be the best way to go about this?

A site just put a blog on http://blog.domain.com/

Should there be a separate XML Sitemap for that particular subdomain or should the original XML Sitemap for the main domain be sufficient?

Looking forward to your responses.

Thanks

[wissamdandan]

Dear searchpl,

It will be better to add and verify blog.domain.com in your GWT, and add a separate sitemap inside this account.