| http://www.w3.org/ns/prov#value | - The best thing about this setup is that it works for debugging and logging at the same time, and the logging_messagef() function can be changed to do several different things (printf to stderr, to a log file, use syslog or some other system logging facility, etc.), and messages below a certain level can be ignored in logging_messagef() when you do not need them.
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