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 5df78de..692d96d 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
@@ -34,5 +34,10 @@ public class AccessPath {
 	
 	public static final String REFERENCE = "reference";
 	public static final String DIRECTION = "direction";
+
+	public static final String RESOURCE_INSTANCES_PATH_PART = "resourceInstances";
+	
+	public static final String RELATION_TYPE_PATH_PART = "relationType";
+	public static final String FACET_TYPE_PATH_PART = "facetType";
 	
 }