Fri, 05 May 2006 21:59:46 +0200 added class_error and exception CLASS_ERROR (supercedes DOMAIN);
wenzelm [Fri, 05 May 2006 21:59:46 +0200] rev 19578
added class_error and exception CLASS_ERROR (supercedes DOMAIN); clarified of_class_derivation; tuned witness_sorts;
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