--- a/model/ProvenanceModel.html	Thu Oct 06 12:16:14 2011 +0100
+++ b/model/ProvenanceModel.html	Thu Oct 06 12:20:35 2011 +0100
@@ -1331,7 +1331,17 @@
 
 <div class='issue'>Should derivation have a time? Which time? This is   <a href="http://www.w3.org/2011/prov/track/issues/43">ISSUE-43</a>.</div>
 
-<div class='issue'>TODO: transitivity problem? This is   <a href="http://www.w3.org/2011/prov/track/issues/43">ISSUE-xxx</a>.</div>
+<div class='issue'>Derivations must take into account characterization intervals, otherwise, transitivity
+leads to incorrect conclusion. This is   <a href="http://www.w3.org/2011/prov/track/issues/108">ISSUE-108</a>.
+<pre>
+
+                         -------------   e1
+ --------------------------------------- e2
+    -------------                        e3
+</pre>
+  dependedOn(e2,e1) does not make sense, since e1 began to exist after e2.
+
+</div>