Unparsed commas are printed.
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#99 Unparsed commas are printed.
Arrays are delimited by spaces in RIB, but some people have been known to use commas, perhaps out of habit. Pixie passes through the extra commas and prints them on stdout. In comparison, Aqsis and BMRT both throw syntax errors and refuse to display the cube. While Pixie's behavior is more fault-tolerant, it's certainly a bit confusing at first.
The RIB is from: http://cs.anu.edu.au/Student/comp4610/2006/labs/cube.rib
RIB file with extra comments.
This is an interesting point. I am tempted to go with the current implementation as it is more forgiving. Another approach could be printing warnings.