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 569f2df..e2e011d 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
@@ -19,6 +19,8 @@ public class AccessPath {
 	
 	public static final String HIERARCHICAL_MODE_QUERY_PARAMETER = InstancePath.HIERARCHICAL_MODE_QUERY_PARAMETER;
 	public static final String INCLUDE_CONTEXTS_QUERY_PARAMETER = InstancePath.INCLUDE_CONTEXTS_QUERY_PARAMETER;
+	public static final String INCLUDE_META_QUERY_PARAMETER = InstancePath.INCLUDE_META_QUERY_PARAMETER;
+	public static final String INCLUDE_META_IN_ALL_INSTANCES_QUERY_PARAMETER = InstancePath.INCLUDE_META_IN_ALL_INSTANCES_QUERY_PARAMETER;
 	
 	/**
 	 * Used only in getRelated() function
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 fd4fefb..97dd984 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
@@ -1,5 +1,8 @@
 package org.gcube.informationsystem.resourceregistry.api.rest;
 
+import org.gcube.informationsystem.base.reference.IdentifiableElement;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
+
 /**
  * @author Luca Frosini (ISTI - CNR)
  */
@@ -13,4 +16,17 @@ public class InstancePath {
 	
 	public static final String INCLUDE_CONTEXTS_QUERY_PARAMETER = "includeContexts";
 	
+	/**
+	 * Request to include {@link Metadata} in {@link IdentifiableElement} root instance
+	 */
+	public static final String INCLUDE_META_QUERY_PARAMETER = "includeMeta";
+	
+	/**
+	 * Request to include {@link Metadata} in all {@link IdentifiableElement}
+	 * instance.
+	 * It must be used in conjunction with {@link #INCLUDE_META_QUERY_PARAMETER}
+	 * If {@link #INCLUDE_META_QUERY_PARAMETER} is false it has no meaning
+	 */
+	public static final String INCLUDE_META_IN_ALL_INSTANCES_QUERY_PARAMETER = "includeAllMeta";
+	
 }