Sun, 11 Jan 2009 19:32:26 +0100 wenzelm maintain Isabelle properties via object Isabelle.Property with apply/update methods;
Sun, 11 Jan 2009 17:35:56 +0100 immler created DynamicTokenMarker
Sun, 11 Jan 2009 13:46:26 +0100 immler explicitly refer to superclass
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