module: ietf-if-flexible-encapsulation

  augment /if:interfaces/if:interface/if-ext:encapsulation
            /if-ext:encaps-type:
    +--:(flexible)
       +--rw flexible
          +--rw match
          |  +--rw (match-type)
          |     +--:(default)
          |     |  +--rw default?                 empty
          |     +--:(untagged)
          |     |  +--rw untagged?                empty
          |     +--:(dot1q-priority-tagged)
          |     |  +--rw dot1q-priority-tagged
          |     |     +--rw tag-type    dot1q-types:dot1q-tag-type
          |     +--:(dot1q-vlan-tagged)
          |        +--rw dot1q-vlan-tagged
          |           +--rw outer-tag
          |           |  +--rw tag-type    dot1q-tag-type
          |           |  +--rw vlan-id     union
          |           +--rw second-tag!
          |           |  +--rw tag-type    dot1q-tag-type
          |           |  +--rw vlan-id     union
          |           +--rw match-exact-tags?   empty
          +--rw rewrite {flexible-rewrites}?
          |  +--rw (direction)?
          |     +--:(symmetrical)
          |     |  +--rw symmetrical
          |     |     +--rw dot1q-tag-rewrite {dot1q-tag-rewrites}?
          |     |        +--rw pop-tags?    uint8
          |     |        +--rw push-tags!
          |     |           +--rw outer-tag
          |     |           |  +--rw tag-type    dot1q-tag-type
          |     |           |  +--rw vlan-id     vlanid
          |     |           +--rw second-tag!
          |     |              +--rw tag-type    dot1q-tag-type
          |     |              +--rw vlan-id     vlanid
          |     +--:(asymmetrical) {asymmetric-rewrites}?
          |        +--rw ingress
          |        |  +--rw dot1q-tag-rewrite {dot1q-tag-rewrites}?
          |        |     +--rw pop-tags?    uint8
          |        |     +--rw push-tags!
          |        |        +--rw outer-tag
          |        |        |  +--rw tag-type    dot1q-tag-type
          |        |        |  +--rw vlan-id     vlanid
          |        |        +--rw second-tag!
          |        |           +--rw tag-type    dot1q-tag-type
          |        |           +--rw vlan-id     vlanid
          |        +--rw egress
          |           +--rw dot1q-tag-rewrite {dot1q-tag-rewrites}?
          |              +--rw pop-tags?    uint8
          |              +--rw push-tags!
          |                 +--rw outer-tag
          |                 |  +--rw tag-type    dot1q-tag-type
          |                 |  +--rw vlan-id     vlanid
          |                 +--rw second-tag!
          |                    +--rw tag-type    dot1q-tag-type
          |                    +--rw vlan-id     vlanid
          +--rw local-traffic-default-encaps!
             +--rw outer-tag
             |  +--rw tag-type    dot1q-tag-type
             |  +--rw vlan-id     vlanid
             +--rw second-tag!
                +--rw tag-type    dot1q-tag-type
                +--rw vlan-id     vlanid