Finally, here's a draft document about outputValueCalc, unparsing, and, variables, and such.

Also attached is a zipped eclipse project containing two subdirs: outputValueCalc has examples of ... outputValueCalc, and variables has an envelope payload example enhanced and corrected somewhat over a prior one I sent.

There's one entirely new concept here. I added an attribute to dfdl:defineVariable to specify whether the variable is for input (parsing) or output (unparsing). I was unable to get things to work in any simple manner without separating the two classes of variable. This doesn't seem too bad actually.

...mike

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TURNING DATA INTO ANSWERS. FASTER THAN YOU EVER IMAGINED.