What are the numbers following Apache settings output paths?

[Dotan Cohen]

Hello, I would appreciate some help understanding the output of Apache -S

$ apachectl -S
/usr/sbin/apachectl: 87: ulimit: error setting limit (Operation not permitted)
VirtualHost configuration:
wildcard NameVirtualHosts and _default_ servers:
*:443                  is a NameVirtualHost
         default server foobar.com (/etc/apache2/sites-enabled/foobar-ssl:2)
         port 443 namevhost foobar.com (/etc/apache2/sites-enabled/foobar-ssl:2)
         port 443 namevhost alice.com
(/etc/apache2/sites-enabled/alice.com-ssl:2)
*:80                   is a NameVirtualHost
         default server localhost (/etc/apache2/sites-enabled/000-default:1)
         port 80 namevhost localhost (/etc/apache2/sites-enabled/000-default:1)
         port 80 namevhost foobar.com (/etc/apache2/sites-enabled/foobar:1)
         port 80 namevhost alice.com (/etc/apache2/sites-enabled/alice.com:1)
Syntax OK

Question: What is the :1 or :2 at the end of each config file listed,
for instance:
/etc/apache2/sites-enabled/foobar:1

I am writing a Python script to parse this output, and I don't want to
disregard this information without understanding it. Thank you!

-- 
Dotan Cohen

http://gibberish.co.il
http://what-is-what.com