Tue, 20 Jan 2009 20:05:21 +0100 wenzelm use Symbol.Interpretation from IsabelleSystem instance;
Tue, 20 Jan 2009 18:23:40 +0100 wenzelm replaced java.util.Property by plain association list;
Tue, 20 Jan 2009 18:20:50 +0100 wenzelm use IsabelleProcess.parse_message (with global Isabelle.system instance);
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