diff -r 129db1416717 -r d83797ef0d2d src/Pure/General/pretty.scala
--- a/src/Pure/General/pretty.scala	Mon Nov 28 20:39:08 2011 +0100
+++ b/src/Pure/General/pretty.scala	Mon Nov 28 22:05:32 2011 +0100
@@ -19,11 +19,12 @@
   object Block
   {
     def apply(i: Int, body: XML.Body): XML.Tree =
-      XML.Elem(Markup(Markup.BLOCK, Markup.Indent(i)), body)
+      XML.Elem(Markup(Isabelle_Markup.BLOCK, Isabelle_Markup.Indent(i)), body)
 
     def unapply(tree: XML.Tree): Option[(Int, XML.Body)] =
       tree match {
-        case XML.Elem(Markup(Markup.BLOCK, Markup.Indent(i)), body) => Some((i, body))
+        case XML.Elem(Markup(Isabelle_Markup.BLOCK, Isabelle_Markup.Indent(i)), body) =>
+          Some((i, body))
         case _ => None
       }
   }
@@ -31,11 +32,12 @@
   object Break
   {
     def apply(w: Int): XML.Tree =
-      XML.Elem(Markup(Markup.BREAK, Markup.Width(w)), List(XML.Text(Symbol.spaces(w))))
+      XML.Elem(Markup(Isabelle_Markup.BREAK, Isabelle_Markup.Width(w)),
+        List(XML.Text(Symbol.spaces(w))))
 
     def unapply(tree: XML.Tree): Option[Int] =
       tree match {
-        case XML.Elem(Markup(Markup.BREAK, Markup.Width(w)), _) => Some(w)
+        case XML.Elem(Markup(Isabelle_Markup.BREAK, Isabelle_Markup.Width(w)), _) => Some(w)
         case _ => None
       }
   }