Added cubby-holes for new projects.
diff --git a/net/api/src/main/java/org/onlab/onos/net/topology/TopologyDescription.java b/net/api/src/main/java/org/onlab/onos/net/topology/TopologyDescription.java
new file mode 100644
index 0000000..0c55314
--- /dev/null
+++ b/net/api/src/main/java/org/onlab/onos/net/topology/TopologyDescription.java
@@ -0,0 +1,20 @@
+package org.onlab.onos.net.topology;
+
+import org.onlab.onos.net.Description;
+
+import java.util.Collection;
+
+/**
+ * Describes attribute(s) of a network topology.
+ */
+public interface TopologyDescription extends Description {
+
+ /**
+ * A collection of Device, Link, and Host descriptors that describe
+ * the changes tha have occurred in the network topology.
+ *
+ * @return network element descriptions describing topology change
+ */
+ Collection<Description> details();
+
+}