Index: branches/weighted-transfer/apertium/apertium/transfer-weights.dtd
===================================================================
--- branches/weighted-transfer/apertium/apertium/transfer-weights.dtd	(revision 70204)
+++ branches/weighted-transfer/apertium/apertium/transfer-weights.dtd	(revision 70205)
@@ -1,10 +1,15 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!ELEMENT transfer-weights (rule+)>
+<!ELEMENT transfer-weights (rule-group+)>
 <!-- 
      'transfer-weights' is a root element.
 -->
 
+<!ELEMENT rule-group (rule+)>
+<!--
+     An element used to keep all mutually ambiguous rules together.
+-->
+
 <!ELEMENT rule (pattern+)>
 <!ATTLIST rule id ID #REQUIRED
                md5 CDATA #REQUIRED