Rsyslog filter to load module

Hey everyone

I'm facing a problem right now :

I have a first machine (we will call it A), on which i've installed a Zabbix server, to monitor some other servers.

I would like to monitor the syslog daemon. And then i found : omsnmp, a rsyslog module which is able to send SNMP traps to my Zabbix machine A.

But, the problem is that, the syslog is too much important, and i don't want to send every message (information, warning, critical, ...)

I would like to send only critical messages present in syslog.

But, i don't have any parameter in the module omsnmp to specify the filter.

I would like to know, using http://www.rsyslog.com/doc/rsyslog%255Fconf%255Ffilter.html this documentation, if i'm able to do something like :

if $severity== 'critical' then {
   *.* action(type="omsnmp" parameters ??")  - i load the module with parameters

}

Any help would be appreciated,

Waiting for any answers, or tracks to follow

Thanks,
sleakerz