| http://www.w3.org/ns/prov#value | - Imagine now that your CGI script send some output to STDOUT, then some messages to STDERR, and just after that the rest of the output to STDOUT. If we allowed mixing both streams output and sending it back to the browser, this will generate unreadable pages (and which will confuse even the developer especially if the output is an image or a non-text object).
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