--- a/model/comments/issue-331-graham.txt	Wed Apr 11 10:06:37 2012 +0100
+++ b/model/comments/issue-331-graham.txt	Wed Apr 11 10:28:57 2012 +0100
@@ -297,7 +297,16 @@
   > be an aspect for domain-specific extension?
   > 
 
-To be discussed in WG.
+
+It's exactly RDF container
+http://www.w3.org/TR/rdf-schema/#ch_containermembershipproperty
+
+except that keys are not restricted to be rdf:_1, rdf:_2, ... but
+allowed to be prov-dm values.
+
+
+Can also describe car (rdf:first), cdr (rdf:rest) for list.
+
 
   > 
   > I think accounts should have a section of their own, since they underpin the key