Hello DFDL community,

There are two ways file formats denote that a region has a nil value:


  *   In-band nil: a symbol inserted into the region indicates nil. A part of 
the region's value space is reserved for indicating nil.
  *   Out-of-band nil: a symbol, separate from the region, indicates that the 
region has a nil value.

I am seeking examples of each. Can you tell me a file format that uses in-band 
nil? Can you tell me a file format that uses out-of-band nil?

/Roger

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