diff -r bc5c96c74514 -r 77075c576d4c src/HOL/ROOT
--- a/src/HOL/ROOT	Sun Jun 23 14:26:49 2013 +0200
+++ b/src/HOL/ROOT	Sun Jun 23 16:47:45 2013 +0200
@@ -357,7 +357,9 @@
 
 session "HOL-Proofs-ex" in "Proofs/ex" = "HOL-Proofs" +
   options [document = false, proofs = 2, skip_proofs = false, parallel_proofs = 0]
-  theories Hilbert_Classical
+  theories
+    Hilbert_Classical
+    XML_Data
 
 session "HOL-Proofs-Extraction" in "Proofs/Extraction" = "HOL-Proofs" +
   description {*