Mon, 28 Nov 2011 22:05:32 +0100 wenzelm separate module for concrete Isabelle markup;
Mon, 28 Nov 2011 20:39:08 +0100 wenzelm renamed Isabelle_Markup to Isabelle_Rendering to emphasize its meaning and make room for Pure Isabelle_Markup module;
Mon, 28 Nov 2011 20:31:53 +0100 wenzelm tuned signature (according to ML version);
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