diff --git a/core/api/src/main/java/org/onosproject/net/newresource/ResourceId.java b/core/api/src/main/java/org/onosproject/net/newresource/ResourceId.java
index 6bfc3cc..1be737e 100644
--- a/core/api/src/main/java/org/onosproject/net/newresource/ResourceId.java
+++ b/core/api/src/main/java/org/onosproject/net/newresource/ResourceId.java
@@ -20,35 +20,63 @@
 import org.onosproject.net.DeviceId;
 import org.onosproject.net.PortNumber;
 
+import java.util.Arrays;
 import java.util.Objects;
 
+import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Preconditions.checkState;
 
 /**
  * Represents identifier of resource.
  * This class is exposed to public, but intended to use only in ResourceStore implementations.
  */
 @Beta
-public final class ResourceId {
-    static final ResourceId ROOT = new ResourceId();
+public abstract class ResourceId {
+    static final ResourceId ROOT = new Discrete();
 
     final ImmutableList<Object> components;
 
-    static ResourceId of(DeviceId device, Object... components) {
-        return new ResourceId(ImmutableList.builder()
+    static ResourceId discrete(DeviceId device, Object... components) {
+        return new Discrete(ImmutableList.builder()
                 .add(device)
                 .add(components)
                 .build());
     }
 
-    static ResourceId of(DeviceId device, PortNumber port, Object... components) {
-        return new ResourceId(ImmutableList.builder()
+    static ResourceId discrete(DeviceId device, PortNumber port, Object... components) {
+        return new Discrete(ImmutableList.builder()
                 .add(device)
                 .add(port)
                 .add(components)
                 .build());
     }
 
+    static ResourceId continuous(DeviceId device, Object... components) {
+        Object last = components[components.length - 1];
+        checkArgument(last instanceof Class<?>);
+
+        return continuous(ImmutableList.builder()
+                .add(device)
+                .add(Arrays.copyOfRange(components, 0, components.length - 1)), (Class<?>) last);
+    }
+
+    static ResourceId continuous(DeviceId device, PortNumber port, Object... components) {
+        Object last = components[components.length - 1];
+        checkArgument(last instanceof Class<?>);
+
+        return continuous(ImmutableList.builder()
+                .add(device)
+                .add(port)
+                .add(Arrays.copyOfRange(components, 0, components.length - 1)), (Class<?>) last);
+    }
+
+    private static ResourceId continuous(ImmutableList.Builder<Object> parentComponents, Class<?> last) {
+        return new Continuous(parentComponents
+                .add(last.getCanonicalName())
+                .build(), last.getSimpleName());
+    }
+
     private ResourceId(ImmutableList<Object> components) {
         this.components = checkNotNull(components);
     }
@@ -63,15 +91,31 @@
         if (components.size() == 1) {
             return ROOT;
         } else {
-            return new ResourceId(components.subList(0, components.size() - 1));
+            return new Discrete(components.subList(0, components.size() - 1));
         }
     }
 
-    ResourceId child(Object child) {
-        return new ResourceId(ImmutableList.builder()
-                .addAll(components)
-                .add(child)
-                .build());
+    /**
+     * Returns a resource ID of a child of this resource based on the specified object.
+     * If the argument is an instance of {@link Class}, this method returns an instance of
+     * {@link Continuous}. Otherwise, it returns an instance of {@link Discrete}
+     * This method only work when the receiver is {@link Discrete}. Otherwise,
+     * this method throws an exception.
+     *
+     * @param child the last component of the child
+     * @return a child resource ID
+     */
+    public ResourceId child(Object child) {
+        checkState(this instanceof Discrete);
+
+        if (child instanceof Class<?>) {
+            return continuous(ImmutableList.builder().addAll(components), (Class<?>) child);
+        } else {
+            return new Discrete(ImmutableList.builder()
+                    .addAll(components)
+                    .add(child)
+                    .build());
+        }
     }
 
     @Override
@@ -84,11 +128,10 @@
         if (this == obj) {
             return true;
         }
-        if (!(obj instanceof ResourceId)) {
+        if (obj == null || getClass() != obj.getClass()) {
             return false;
         }
-
-        ResourceId other = (ResourceId) obj;
+        final ResourceId other = (ResourceId) obj;
         return Objects.equals(this.components, other.components);
     }
 
@@ -96,4 +139,45 @@
     public String toString() {
         return components.toString();
     }
+
+    /**
+     * ResourceId for {@link Resource.Discrete}.
+     *
+     * Note: This class is exposed to the public, but intended to be used in the resource API
+     * implementation only. It is not for resource API user.
+     */
+    public static final class Discrete extends ResourceId {
+        private Discrete(ImmutableList<Object> components) {
+            super(components);
+        }
+
+        private Discrete() {
+            super();
+        }
+    }
+
+    /**
+     * ResourceId for {@link Resource.Continuous}
+     *
+     * Note: This class is exposed to the public, but intended to be used in the resource API
+     * implementation only. It is not for resource API user.
+     */
+    public static final class Continuous extends ResourceId {
+        // for printing purpose only (used in toString() implementation)
+        private final String name;
+
+        private Continuous(ImmutableList<Object> components, String name) {
+            super(components);
+            this.name = checkNotNull(name);
+        }
+
+        @Override
+        public String toString() {
+            // due to performance consideration, the value might need to be stored in a field
+            return ImmutableList.builder()
+                    .addAll(components.subList(0, components.size() - 1))
+                    .add(name)
+                    .build().toString();
+        }
+    }
 }