Renamed *Instance to *Node for better readability and to avoid conflict with notion of Karaf instance.
Added cluster service and trivial store implementations.
diff --git a/core/api/src/main/java/org/onlab/onos/net/device/DeviceStore.java b/core/api/src/main/java/org/onlab/onos/net/device/DeviceStore.java
index 851fbc1..3ed477b 100644
--- a/core/api/src/main/java/org/onlab/onos/net/device/DeviceStore.java
+++ b/core/api/src/main/java/org/onlab/onos/net/device/DeviceStore.java
@@ -10,7 +10,7 @@
 import java.util.List;
 
 /**
- * Manages inventory of infrastructure devices.
+ * Manages inventory of infrastructure devices; not intended for direct use.
  */
 public interface DeviceStore {
 
diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/FlowRuleStore.java b/core/api/src/main/java/org/onlab/onos/net/flow/FlowRuleStore.java
index 0698721..f00b595 100644
--- a/core/api/src/main/java/org/onlab/onos/net/flow/FlowRuleStore.java
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/FlowRuleStore.java
@@ -3,7 +3,7 @@
 import org.onlab.onos.net.DeviceId;
 
 /**
- * Manages inventory of flow rules.
+ * Manages inventory of flow rules; not intended for direct use.
  */
 public interface FlowRuleStore {
 
diff --git a/core/api/src/main/java/org/onlab/onos/net/host/HostStore.java b/core/api/src/main/java/org/onlab/onos/net/host/HostStore.java
index 94c4585..ea316b2 100644
--- a/core/api/src/main/java/org/onlab/onos/net/host/HostStore.java
+++ b/core/api/src/main/java/org/onlab/onos/net/host/HostStore.java
@@ -12,8 +12,7 @@
 import java.util.Set;
 
 /**
- * Manages inventory of end-station hosts. It may do so using whatever
- * means are appropriate.
+ * Manages inventory of end-station hosts; not intended for direct use.
  */
 public interface HostStore {
 
diff --git a/core/api/src/main/java/org/onlab/onos/net/link/LinkStore.java b/core/api/src/main/java/org/onlab/onos/net/link/LinkStore.java
index 4391471..dbe4877 100644
--- a/core/api/src/main/java/org/onlab/onos/net/link/LinkStore.java
+++ b/core/api/src/main/java/org/onlab/onos/net/link/LinkStore.java
@@ -8,8 +8,7 @@
 import java.util.Set;
 
 /**
- * Manages inventory of infrastructure links. It may do so using whatever
- * means are appropriate.
+ * Manages inventory of infrastructure links; not intended for direct use.
  */
 public interface LinkStore {
 
diff --git a/core/api/src/main/java/org/onlab/onos/net/topology/TopologyStore.java b/core/api/src/main/java/org/onlab/onos/net/topology/TopologyStore.java
index 5e8b19d..adc6145 100644
--- a/core/api/src/main/java/org/onlab/onos/net/topology/TopologyStore.java
+++ b/core/api/src/main/java/org/onlab/onos/net/topology/TopologyStore.java
@@ -11,8 +11,7 @@
 import java.util.Set;
 
 /**
- * Manages inventory of topology snapshots. It may do so using whatever
- * means appropriate.
+ * Manages inventory of topology snapshots; not intended for direct use.
  */
 public interface TopologyStore {