--- a/ldp.ttl	Mon Feb 18 15:35:54 2013 -0500
+++ b/ldp.ttl	Fri Feb 22 12:03:44 2013 -0500
@@ -25,12 +25,32 @@
 :Container
     a rdfs:Class;
 	rdfs:subClassOf :Resource;
-	rdfs:comment "A Linked Data Platform Resource (LDP-R) that also conforms to 
+	rdfs:comment "A Linked Data Platform Resource (LDPR) that also conforms to 
 	additional patterns and conventions for managing membership.";
 	vs:term_status "unstable";
 	rdfs:isDefinedBy :;
 	rdfs:label "Container".
 	
+:Aggregation
+    a rdfs:Class;
+	rdfs:subClassOf :Container;
+	rdfs:comment "A Linked Data Platform Container (LDPC) that also conforms to 
+	additional patterns and conventions for managing members, for example its 
+	members may continue to exist after its deletion.";
+	vs:term_status "unstable";
+	rdfs:isDefinedBy :;
+	rdfs:label "Aggregation".
+	
+:Composition
+    a rdfs:Class;
+	rdfs:subClassOf :Container;
+	rdfs:comment "A Linked Data Platform Container (LDPC) that also conforms to 
+	additional patterns and conventions for managing members, for example its 
+	members are deleted as part of its deletion.";
+	vs:term_status "unstable";
+	rdfs:isDefinedBy :;
+	rdfs:label "Composition".
+	
 :containerSortPredicates
  	a rdf:Property;
 	rdfs:comment "List of predicates that indicate the ascending order of the members in a page.";