fix for collector #697 - multiple selections

doc/CHANGES.txt

@@ -4,6 +4,16 @@ Zope Changes
   Change information for previous versions of Zope can be found in the
   file HISTORY.txt.
 
+  Zope 2.6.1 beta 2
+
+    Bugs Fixed
+
+      - Collector #697: Multiple selection properties were incorrectly
+        marshalled. note than any non-ascii multiple selection properties
+        modified in versions without this fix will have been corrupted in
+        the zodb.
+
+
   Zope 2.6.1 beta 1
 
     Bugs Fixed

lib/python/OFS/dtml/properties.dtml

@@ -117,7 +117,7 @@ property values, edit the values and click "Save Changes".
 
     <dtml-if "hasProperty(select_variable)">
     <div class="form-element">
-    <select name="<dtml-var id>:utf8:list" multiple
+    <select name="<dtml-var id>:utf8:list:string" multiple
       size="<dtml-var "_.min(7, _.len(getProperty(select_variable)))">">
       <dtml-in "getProperty(select_variable)">
          <option<dtml-if