[GitHub] [daffodil] mbeckerle commented on pull request #886: Update scaladocs mentioning deprecated API

[GitBox <gi...@apache.org>]

mbeckerle commented on PR #886:
URL: https://github.com/apache/daffodil/pull/886#issuecomment-1341772598

   When you restore a saved compiled schema, you should get the initial values of any DFDL external variables, regardless of whether they had any values set before the schema was pre-compiled. 
   
   Saving the parser does NOT lock-down/freeze or even utilize any variable values.  Saving the parser is supposed to be transparent, i.e., only faster, than using the uncompiled schema. 
   
   For example, expressions that refer to variables, even if the variable has been externally set, cannot be constant-folded by the schema compiler to remove the variable reference. Rather, any attempt to reference a variable at schema compile time causes the expression folding to stop. 
   
   There are, however, some tunables you can set which only affect schema compilation. Those are only used by the schema compiler so clearly one cannot subsequently modify them after restoring a saved processor. (You can, but it won't do anything because the compilation is already over. )  Example of this is a tunable to suppress a particular compile-time warning, or to specify a particular interpretation  (UnqualifiedPathStepPolicy is an example.) 


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