On Mon, 2012-04-16 at 14:16 +0200, Jiri Olsa wrote:> group: group_spec '{' events '}'> group_spec: name ':' mod | empty How about something like:groups: groups ',' group | groupgroup: group_name '{' events '}' group_modgroup_name: name ':' | emptygroup_mod: ':' group_mods | emptygroup_mods: [l]