What should an IP based VirtualHost directive look like?

This example is straight out of the stock SWS httpd.conf file.

# VirtualHost example:
# Almost any Apache directive may go into a VirtualHost container.
#
<VirtualHost ip.address.of.host.some_domain.com/>
    ServerAdminwebmaster@host.some_domain.com
    DocumentRoot /www/docs/host.some_domain.com
    ServerName host.some_domain.com/
    ErrorLog logs/host.some_domain.com-...