Added cubby-holes for new projects.
diff --git a/net/api/src/main/java/org/onlab/onos/net/topology/TopologyProviderService.java b/net/api/src/main/java/org/onlab/onos/net/topology/TopologyProviderService.java
new file mode 100644
index 0000000..bef83ed
--- /dev/null
+++ b/net/api/src/main/java/org/onlab/onos/net/topology/TopologyProviderService.java
@@ -0,0 +1,20 @@
+package org.onlab.onos.net.topology;
+
+import org.onlab.onos.net.ProviderService;
+
+/**
+ * Means for injecting topology information into the core.
+ */
+public interface TopologyProviderService extends ProviderService {
+
+ // What can be conveyed in a topology that isn't by individual
+ // providers?
+
+ /**
+ * Signals the core that some aspect of the topology has changed.
+ *
+ * @param topoDescription information about topology
+ */
+ void topologyChanged(TopologyDescription topoDescription);
+
+}