<query id="deleteMessagesMember" action="delete">
  <tables>
    <table name="member_message" />
  </tables>
  <conditions>
    <condition operation="equal" column="message_type" var="message_type" />
    <group pipe="and">
		<condition operation="equal" column="sender_srl" var="sender_srl" />
		<condition operation="equal" column="receiver_srl" var="receiver_srl" pipe="or" />
    </group>
  </conditions>
</query>
