diff --git a/apps/config/src/main/java/org/onosproject/d/config/ResourceIds.java b/apps/config/src/main/java/org/onosproject/d/config/ResourceIds.java
new file mode 100644
index 0000000..4340d27
--- /dev/null
+++ b/apps/config/src/main/java/org/onosproject/d/config/ResourceIds.java
@@ -0,0 +1,162 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.d.config;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static org.slf4j.LoggerFactory.getLogger;
+
+import org.onosproject.yang.model.DataNode;
+import org.onosproject.yang.model.KeyLeaf;
+import org.onosproject.yang.model.LeafListKey;
+import org.onosproject.yang.model.ListKey;
+import org.onosproject.yang.model.NodeKey;
+import org.onosproject.yang.model.ResourceId;
+import org.onosproject.yang.model.ResourceId.Builder;
+import org.onosproject.yang.model.SchemaId;
+import org.slf4j.Logger;
+
+import com.google.common.annotations.Beta;
+
+/**
+ * Utility related to ResourceId.
+ */
+@Beta
+public abstract class ResourceIds {
+
+    private static final Logger log = getLogger(ResourceIds.class);
+
+    /**
+     * Builds the ResourceId of specified {@code node}.
+     *
+     * @param parent ResourceId of {@code node} parent
+     * @param node to create ResourceId.
+     * @return ResourceId of {@code node}
+     */
+    public static ResourceId resourceId(ResourceId parent, DataNode node) {
+        final ResourceId.Builder builder;
+        if (parent == null) {
+            builder = ResourceId.builder();
+        } else {
+            try {
+                builder = parent.copyBuilder();
+            } catch (CloneNotSupportedException e) {
+                throw new IllegalArgumentException(e);
+            }
+        }
+
+        SchemaId sid = node.key().schemaId();
+        switch (node.type()) {
+        case MULTI_INSTANCE_LEAF_VALUE_NODE:
+            builder.addLeafListBranchPoint(sid.name(), sid.namespace(),
+                                           ((LeafListKey) node.key()).asString());
+            break;
+
+        case MULTI_INSTANCE_NODE:
+            builder.addBranchPointSchema(sid.name(), sid.namespace());
+            for (KeyLeaf keyLeaf : ((ListKey) node.key()).keyLeafs()) {
+                builder.addKeyLeaf(keyLeaf.leafSchema().name(),
+                                   keyLeaf.leafSchema().namespace(),
+                                   keyLeaf.leafValAsString());
+            }
+            break;
+
+        case SINGLE_INSTANCE_LEAF_VALUE_NODE:
+        case SINGLE_INSTANCE_NODE:
+            builder.addBranchPointSchema(sid.name(), sid.namespace());
+            break;
+
+        default:
+            throw new IllegalArgumentException("Unknown type " + node);
+
+        }
+
+        return builder.build();
+    }
+
+    /**
+     * Concats {@code path} after {@code prefix}.
+     *
+     * @param prefix path
+     * @param path to append after {@code path}
+     * @return concatenated ResouceId
+     */
+    public static ResourceId concat(ResourceId prefix, ResourceId path) {
+        checkArgument(!path.nodeKeys().contains(DeviceResourceIds.ROOT_NODE),
+                      "%s was already absolute path", path);
+        try {
+            return prefix.copyBuilder().append(path).build();
+        } catch (CloneNotSupportedException e) {
+            log.error("Could not copy {}", path, e);
+            throw new IllegalArgumentException("Could not copy " + path, e);
+        }
+    }
+
+
+    /**
+     * Returns {@code child} ad relative ResourceId against {@code base}.
+     *
+     * @param base ResourceId
+     * @param child ResourceId to relativize
+     * @return relative ResourceId
+     */
+    public static ResourceId relativize(ResourceId base, ResourceId child) {
+        checkArgument(child.nodeKeys().size() >= base.nodeKeys().size(),
+                      "%s path must be deeper than base prefix %s", child, base);
+        checkArgument(base.nodeKeys().equals(child.nodeKeys().subList(0, base.nodeKeys().size())),
+                      "%s is not a prefix of %s", child, base);
+
+        // FIXME waiting for Yang tools 2.2.0-b4 or later
+//        return ResourceId.builder().append(child.nodeKeys().subList(base.nodeKeys().size(),
+//                                                                    child.nodeKeys().size())).build();
+
+        Builder builder = ResourceId.builder();
+        for (NodeKey nodeKey : child.nodeKeys().subList(base.nodeKeys().size(),
+                                                        child.nodeKeys().size())) {
+            if (nodeKey instanceof ListKey) {
+                ListKey listKey = (ListKey) nodeKey;
+                for (KeyLeaf keyLeaf : listKey.keyLeafs()) {
+                    builder.addKeyLeaf(keyLeaf.leafSchema().name(),
+                                       keyLeaf.leafSchema().namespace(),
+                                       keyLeaf.leafValAsString());
+                }
+            } else if (nodeKey instanceof LeafListKey) {
+                LeafListKey llKey = (LeafListKey) nodeKey;
+                builder.addLeafListBranchPoint(llKey.schemaId().name(),
+                                               llKey.schemaId().namespace(),
+                                               llKey.value());
+
+            } else {
+                builder.addBranchPointSchema(nodeKey.schemaId().name(),
+                                             nodeKey.schemaId().namespace());
+            }
+        }
+        return builder.build();
+    }
+
+    /**
+     * Tests if {@code child} starts with {@code prefix}.
+     *
+     * @param prefix expected
+     * @param child to test
+     * @return true if {@code child} starts with {@code prefix}
+     */
+    public static boolean isPrefix(ResourceId prefix, ResourceId child) {
+
+        return child.nodeKeys().size() >= prefix.nodeKeys().size() &&
+               prefix.nodeKeys().equals(child.nodeKeys().subList(0, prefix.nodeKeys().size()));
+    }
+
+}