igmp v3 query

Hi,
I have doubt in rfc 3376 (IGMP v3).

section 5 :
	There are two types of events that trigger IGMPv3 protocol actions on 
an interface:

    o a change of the interface reception state, caused by a local
      invocation of IPMulticastListen.

    o reception of a Query.

    (Received IGMP messages of types other than Query are silently
    ignored, except as required for interoperation with earlier versions
    of IGMP.) <<=====================i have doubt in this...
we need to drop the messages other than query messages?. THis says that
we need to receive only one message in igmpv3 ? i m totally confused?

Thanks
Ajay