Delete A List, Delete All List

[InterNALXz]

when I use a xml to delete index 2:
<edit-config xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0"><target><running/></target><config><xacl nc:operation="delete" xmlns="x-acl"><rule><index>2</index></rule></xacl ></config></edit-config>

yang is :
`module x-acl{

namespace "x-acl;

prefix "x-acl";

import ietf-inet-types{
    prefix "inet";
}

revision 2015-05-18{
    description "Initial revision";
}

container xacl{
    list rule{
        key index;
        leaf index{
            type uint32;
        }
        leaf xid{
            type uint8;
        }}}`

and other index also be deleted, how can I modify this