detail explanation for format in yang action

[tahigash]

need more explanation for format in yang action.
doc link : https://pubhub.devnetcloud.com/media/pyats-development-guide/docs/writeblitz/details/yang.html#format-options

format:
  request_mode:    # [STREAM, ONCE, POLL] gNMI subscription mode
  sub_mode:        # [ON_CHANGE, SAMPLE] gNMI subscription sub_mode
  encoding:        # [JSON, JSON_IETF] gNMI val encoding
  prefix:          # [true | false] gNMI message requires PATH prefix
  origin:          # [openconfig | rfc7951 | <device defined> ] gNMI origin
  base64:          # [true | false] gNMI set "val" requires Base64 encoding
  sample_interval: # number of seconds between sampling
  stream_max:      # seconds to stop stream (default: 0, no max)
  auto-validate:   # [true | false] automatically validate config messages
  negative-test:   # [true | false] expecting device to return an error
  pause:           # pause N seconds between each test (default: 0, no pause)
  sequence:        # [true | false] return values and return sequence verified

for example, sequence will change the return. but no detail at this point.