Puppet users - May 2014 - Revert configuration file to old state if content changes

Hi,

I am using puppet enterprise 3.x . I have a manifest used to install and 
manage custom application on my client node.
Part of manifest is :-

   file { 'app_config':
                ensure  => directory,
                mode    => 0644,
                path    => '/etc/cmas/app_config',
                source  => 'puppet:///modules/cmas/app_config',
                recurse => true,
        }
        
    file { 'config.xml':
              audit   => "content",
              path    => '/etc/cmas/app_config/config.xml',
           }

I want if file config.xml is changed, it should get back to old one from 
source in next puppet run.
is it possible to do it ?

Thanks and Regards,
Punit


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