diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/api/rest/AccessPath.java b/src/main/java/org/gcube/informationsystem/resourceregistry/api/rest/AccessPath.java
index e60f701..8aaf9de 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/api/rest/AccessPath.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/api/rest/AccessPath.java
@@ -5,17 +5,17 @@ package org.gcube.informationsystem.resourceregistry.api.rest;
  */
 public class AccessPath {
 	
+	public static final String HIERARCHICAL_MODE_PARAM = InstancePath.HIERARCHICAL_MODE_PARAM;
+	
 	public static final String TYPE_PATH_PARAM = "TYPE_NAME";
 	public static final String UUID_PATH_PARAM = "UUID";
 	public static final String CONTEXT_UUID_PATH_PARAM = "CONTEXT_UUID";
 	
-	
 	public static final String ACCESS_PATH_PART = "access";
 	public static final String CONTEXTS_PATH_PART = ContextPath.CONTEXTS_PATH_PART;
 	public static final String TYPES_PATH_PART = TypePath.TYPES_PATH_PART;
 	public static final String INSTANCES_PATH_PART = InstancePath.INSTANCES_PATH_PART;
-	
-	
+		
 	public static final String QUERY_PATH_PART = "query";
 	
 	public static final String QUERY_PARAM = "q";
diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/api/rest/InstancePath.java b/src/main/java/org/gcube/informationsystem/resourceregistry/api/rest/InstancePath.java
index 17815bd..5d8fad1 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/api/rest/InstancePath.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/api/rest/InstancePath.java
@@ -6,4 +6,5 @@ public class InstancePath {
 	
 	public static final String POLYMORPHIC_PARAM = AccessPath.POLYMORPHIC_PARAM;
 	
+	public static final String HIERARCHICAL_MODE_PARAM = "hierarchical";
 }