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The key “backscatter” will return an array with all the backscatter values in the BUFR tree, while will return the values of backscatter in the branch of the tree where the condition "beamIdentifier=3" is satisfied.

The key “backscatter” will return an array with all the backscatter values in the BUFR tree, while:
/beamIdentifier=3/backscatter
will return the values of backscatter in the branch of the tree where the condition "beamIdentifier=3" is satisfied.
If the condition is satisfied by more than one branch, all the values for all the branches satisfying the condition are returned.
As an example we can have in a TEMP message the need of getting the values of the temperature or humidity significant levels and this can be achieved by getting the values of the key:
/verticalSoundingSignificance=4/dewpointTemperature
This will return all the values of dewpointTemperature in the BUFR tree for which the verticalSoundingSignificance is 4.

Note: Only a single condition can be provided and it has to be of the form key=value (only the '=' operator is supported). The key has to be in the data section (not header key).

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