stevedlawrence opened a new pull request, #1241:
URL: https://github.com/apache/daffodil/pull/1241

   An inputValueCalc inside a hidden group behaves very similar to a variable, 
but is useful in cases where you don't want to use a variable.
   
   For example, a common pattern is two have groups pairs of elements of 
original data and transformed value. In a subset of cases we may want to hide 
the original/transformed pair and use an non-hidden IVC that references the 
transformed value. By allowing hidden IVC's, we do not need change the pattern 
to use variables.
   
   Only minimal changes are needed because this does not change parse behavior 
and IVC elements are already skipped during unparsing.
   
   DAFFODIL-2903


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