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Specifies the number of custom conditions used to filter messages. The default value is 0. A custom condition can be used with any BUFR key to filter messages. The example below illustrates how it works:
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Let us suppose we have radiosonde data and we want to filter the messages which have any temperature value greater 300 K (the message contains multiple temperature values). The custom filter should look like this:
If we would like to find the messages where the first temperature value is above 300 K the rank should be set accordingly:
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