httpd rewrite rule with a different DocumentRoot dir - mod-rewrite

Question

Is there a way to make a rewrite rule to file located in a different than DocumentRoot path? Say I have domain http://test.ldt/ with DocumentRoot /home/test_ltd/ and I want that when a file is requested under static. subdomain (http://stats.test.ldt/) it would look for requested file from another path, say /home/static_files/
I was advised to use mod_alias. However, I am not sure how to make it work when I need it with subdomain.
to cristis:
You are not right. For example if these would be mine httpd rules:
ServerName domain.ltd
ServerAlias www.domain.ltd
DocumentRoot /home/domain_ltd
RewriteEngine on
RewriteCond %{HTTP_HOST} static2.domain.ltd
RewriteRule (.*)$ /home/static_files/$1 [L]
DirectoryIndex index.html index.htm index.php
And client would request for static2.domain.ltd/foo.txt, the file would be searched in /home/domain_ltd/home/static_files/$1

Answer 1

To me, it would make the most sense to just define the subdomain as a VirtualHost that has a DocumentRoot that points where you wanted it to (Although we're moving into ServerFault territory here technically, I guess...)
e.g.:
<VirtualHost *:80>
ServerName static.domain.tld
DocumentRoot /home/static_files/
<Directory /home/static_files>
Options Indexes FollowSymLinks Includes
AllowOverride All
Order allow,deny
Allow from all
</Directory>
</VirtualHost>
But you could do it with a combination of mod_alias and mod_rewrite too, if you wanted. Something like this should work...
In httpd.conf:
Alias /static /home/static_files
In .htaccess (or preferably in httpd.conf in the Directory section for /home/domain_tld):
RewriteEngine On
RewriteCond %{HTTP_HOST} ^static
RewriteRule ^!static - [C]
RewriteRule ^(.*)$ static/$1 [PT]

Answer 2

You can include the full path in the RewriteRule statement. For instance:
RewriteEngine on
RewriteRule ^/~(([a-z])[a-z0-9]+)(.*) /home/$2/$1/.www$3
(taken from http://httpd.apache.org/docs/2.0/misc/rewriteguide.html)