Mon, 12 Apr 2021 18:29:34 +0200 wenzelm clarified signature: avoid tmp file;
Mon, 12 Apr 2021 18:10:13 +0200 wenzelm clarified signature for Scala functions;
Mon, 12 Apr 2021 15:00:03 +0200 wenzelm clarified message output: flush already happens in write_message_yxml (see Isabelle/22b5ecb53dd9);
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