annotation from downlinkInformationList group not present in the datatree

[agrouaze]

Information on PRF are needed by @lanougue

  <downlinkInformation>
        <swath>IW1</swath>
        <azimuthTime>2022-01-02T17:46:11.559187</azimuthTime>
        <firstLineSensingTime>2022-01-02T17:46:12.683998</firstLineSensingTime>
        <lastLineSensingTime>2022-01-02T17:46:40.456493</lastLineSensingTime>
        <prf>1.717128973878037e+03</prf>
        <bitErrorCount>
          <numErrSyncMarker>0</numErrSyncMarker>
          <numErrDataTakeId>0</numErrDataTakeId>
          <numErrEccNumber>0</numErrEccNumber>
          <numErrTestMode>0</numErrTestMode>
          <numErrRxChannelId>0</numErrRxChannelId>
          <numErrInstrumentConfigId>0</numErrInstrumentConfigId>
          <numErrPacketCount>0</numErrPacketCount>
          <numErrPriCount>0</numErrPriCount>
          <numErrSsbErrorFlag>0</numErrSsbErrorFlag>
          <numErrBaqMode>0</numErrBaqMode>
          <numErrBaqBlockLength>0</numErrBaqBlockLength>
          <numErrRangeDecimation>0</numErrRangeDecimation>
          <numErrRxGain>0</numErrRxGain>
          <numErrTxRampRate>0</numErrTxRampRate>
          <numErrTxPulseStartFrequency>0</numErrTxPulseStartFrequency>
          <numErrRank>0</numErrRank>
          <numErrPri>0</numErrPri>
          <numErrSwst>0</numErrSwst>
          <numErrSwl>0</numErrSwl>
          <numErrPolarisation>0</numErrPolarisation>
          <numErrTempComp>7045</numErrTempComp>
          <numErrElevationBeamAddress>0</numErrElevationBeamAddress>
          <numErrAzimuthBeamAddress>0</numErrAzimuthBeamAddress>
          <numErrSasTestMode>0</numErrSasTestMode>
          <numErrCalType>0</numErrCalType>
          <numErrCalibrationBeamAddress>0</numErrCalibrationBeamAddress>
          <numErrCalMode>0</numErrCalMode>
          <numErrTxPulseNumber>0</numErrTxPulseNumber>
          <numErrSignalType>0</numErrSignalType>
...