dovecot - Aug 2013 - The "<" sign in config files

Hallo experts,

what is the meaning of the "<" sign in config files as in

ssl_key = </etc/pki/tls/private/dovecot.key
          ^
          |
          ?


--Frank Elsner

On 6.8.2013, at 13.28, Frank Elsner <frank at moltke28.B.Shuttle.DE>
wrote:
> what is the meaning of the "<" sign in config files as in
> 
> ssl_key = </etc/pki/tls/private/dovecot.key
>          ^
>          |
>          ?
Read the value from the specified file. Works for all settings.