[users@httpd] is there any include or reference mechanism in apache to store common entries somewhere and include them in virtualhost

[likai]

Hi,
 
Right now, in my httpd.conf I have two sets of virtualhosts for two IPs. I just 
made a copy of the first one and change the IP to another.
By doing this, I created a lot of duplicated entries.
 It may cause apache to load a lot of duplicated entries. 
And sometimes it cannot promise that the contents are the same with the two 
sets of virtualhosts.
 
Listen 443
<VirtualHost IP1:443>
ServerName IP1:443
XXXXXXXX
....
</VirtualHost>
 
<VirtualHost IP2:443>
ServerName IP2:443
XXXXXXXX 
....
</VirtualHost>
 
So is there any include or reference mechanism in apache ?
Like storing the common entries in one place, and referencing or including 
these in the virtualhosts like described below.
 
<common>
    xxxxxxxx
    .....
</common>
 
<virtualhost IP1:443>
include common
reference common
</virtualhost>
 
 
 
<virtualhost IP2:443>
 
include common
 
reference common
 
</virtualhost>
 
 
Any comment will be highly appreciated.
 
Thanks,
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