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3.5.2 On-Change Subscriptions
   A publisher indicates the type of change to a datastore node using
   the different YANG Patch operations: the "create" operation is used
   for newly created objects (except entries in a user-ordered list),
   the "delete" operation is used for deleted objects (including in
   user-ordered lists), the "replace" operation is used when only the
   object value changes, the "insert" operation is used when a new entry
   is inserted in a list, and the "move" operation is used when an
   existing entry in a user-ordered list is moved.

   However, a patch must be able to do more than just describe the delta
   from the previous state to the current state.  As per Section 3.3, it
   must also be able to identify whether transient changes have occurred
   on an object during a dampening period.  To support this, it is valid
   to encode a YANG Patch operation so that its application would result
   in no change between the previous state and the current state.  This
   indicates that some churn has occurred on the object.  An example of
   this would be a patch that indicates a "create" operation for a
   datastore node where the receiver believes one already exists or a
   "replace" operation that replaces a previous value with the same
   value.  Note that this means that the "create" and "delete" errors as
   described in [RFC8072], Section 2.5 are not errors in the case of
   YANG-Push (i.e., they are considered valid operations for YANG-Push).

module: ietf-yang-push

     rpcs:
       +---x resync-subscription {on-change}?
          +---w input
             +---w id    sn:subscription-id

     yang-data (for placement into RPC error responses):
       +-- resync-subscription-error
       |  +--ro reason?                   identityref
       |  +--ro period-hint?              centiseconds
       |  +--ro filter-failure-hint?      string
       |  +--ro object-count-estimate?    uint32
       |  +--ro object-count-limit?       uint32
       |  +--ro kilobytes-estimate?       uint32
       |  +--ro kilobytes-limit?          uint32
       +-- establish-subscription-error-datastore
       |  +--ro reason?                   identityref
       |  +--ro period-hint?              centiseconds
       |  +--ro filter-failure-hint?      string
       |  +--ro object-count-estimate?    uint32
       |  +--ro object-count-limit?       uint32
       |  +--ro kilobytes-estimate?       uint32
       |  +--ro kilobytes-limit?          uint32
       +-- modify-subscription-error-datastore
          +--ro reason?                   identityref
          +--ro period-hint?              centiseconds
          +--ro filter-failure-hint?      string
          +--ro object-count-estimate?    uint32
          +--ro object-count-limit?       uint32
          +--ro kilobytes-estimate?       uint32
          +--ro kilobytes-limit?          uint32

       notifications:
          +---n push-update
          |  +--ro id?                   sn:subscription-id
          |  +--ro datastore-contents?   <anydata>
          |  +--ro incomplete-update?    empty
          +---n push-change-update {on-change}?
             +--ro id?                   sn:subscription-id
             +--ro datastore-changes
             |  +--ro yang-patch
             |     +--ro patch-id    string
             |     +--ro comment?    string
             |     +--ro edit* [edit-id]
             |        +--ro edit-id      string
             |        +--ro operation    enumeration
             |        +--ro target       target-resource-offset
             |        +--ro point?       target-resource-offset
             |        +--ro where?       enumeration
             |        +--ro value?       <anydata>
             +--ro incomplete-update?    empty