Changed nomenclature from Broker to Registry.
diff --git a/net/api/src/main/java/org/onlab/onos/net/topology/TopologyProviderRegistry.java b/net/api/src/main/java/org/onlab/onos/net/topology/TopologyProviderRegistry.java
new file mode 100644
index 0000000..40bfa66
--- /dev/null
+++ b/net/api/src/main/java/org/onlab/onos/net/topology/TopologyProviderRegistry.java
@@ -0,0 +1,10 @@
+package org.onlab.onos.net.topology;
+
+import org.onlab.onos.net.provider.ProviderRegistry;
+
+/**
+ * Abstraction of a network topology provider registry.
+ */
+public interface TopologyProviderRegistry extends
+ ProviderRegistry<TopologyProvider, TopologyProviderService> {
+}