...
+--rw connection
|  +--rw encapsulation
|  |  +--rw type?              identityref
|  |  +--rw dot1q
|  |  |  +--rw tag-type?   identityref
|  |  |  +--rw cvlan-id?   uint16
|  |  +--rw priority-tagged
|  |  |  +--rw tag-type?   identityref
|  |  +--rw qinq
|  |     +--rw tag-type?   identityref
|  |     +--rw svlan-id    uint16
|  |     +--rw cvlan-id    uint16
|  +--rw (l2-service)?
|  |  +--:(l2-tunnel-service)
|  |  |  +--rw l2-tunnel-service
|  |  |     +--rw type?         identityref
|  |  |     +--rw pseudowire
|  |  |     |  +--rw vcid?      uint32
|  |  |     |  +--rw far-end?   union
|  |  |     +--rw vpls
|  |  |     |  +--rw vcid?      uint32
|  |  |     |  +--rw far-end*   union
|  |  |     +--rw vxlan
|  |  |        +--rw vni-id             uint32
|  |  |        +--rw peer-mode?         identityref
|  |  |        +--rw peer-ip-address*   inet:ip-address
|  |  +--:(l2vpn)
|  |     +--rw l2vpn-id?            vpn-common:vpn-id
|  +--rw l2-termination-point?      string
|  +--rw local-bridge-reference?    string
|  +--rw bearer-reference?          string
|  |       {vpn-common:bearer-reference}?
|  +--rw lag-interface {vpn-common:lag-interface}?
|     +--rw lag-interface-id?   string
|     +--rw member-link-list
|        +--rw member-link* [name]
|           +--rw name    string
...