Github user afs commented on the issue:
https://github.com/apache/jena/pull/188
The parser has already thrown RiotException by the time this PR comes into
play. boolean is to note there is "exit(1)" and not "exit(1)" states.
Boolean, enums or exception are all 2-state returns for that condition;
exception and message output or not. This is all within the single class of the
command itself
Dropping bad triples needs parser changes. It is a much wider change.
Indeed, there is an argument not to design to a future feature until that
feature is fully described!
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