Anchors: Alternative Structure

alternative structure: common criteria

anchor "dmz" on $dmz_if {
        pass in proto { tcp udp } to $nameservers port domain
	pass in proto tcp to $webservers port { www https }
	pass in proto tcp to $mailserver port smtp
	pass in log (all, to pflog1) in proto tcp from $mailserver \
                to any port smtp 
	}

Lump related rules together in logical chunks