diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/client/ResourceRegistryClientImpl.java b/src/main/java/org/gcube/informationsystem/resourceregistry/client/ResourceRegistryClientImpl.java
index fbd0c4b..c0d8890 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/client/ResourceRegistryClientImpl.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/client/ResourceRegistryClientImpl.java
@@ -34,7 +34,9 @@ import org.gcube.informationsystem.resourceregistry.api.exceptions.queries.Inval
 import org.gcube.informationsystem.resourceregistry.api.exceptions.queries.templates.QueryTemplateNotFoundException;
 import org.gcube.informationsystem.resourceregistry.api.exceptions.types.SchemaNotFoundException;
 import org.gcube.informationsystem.resourceregistry.api.rest.AccessPath;
+import org.gcube.informationsystem.resourceregistry.api.rest.InstancePath;
 import org.gcube.informationsystem.resourceregistry.api.rest.QueryTemplatePath;
+import org.gcube.informationsystem.resourceregistry.api.rest.TypePath;
 import org.gcube.informationsystem.resourceregistry.api.rest.httputils.HTTPUtility;
 import org.gcube.informationsystem.resourceregistry.api.utils.Utility;
 import org.gcube.informationsystem.types.TypeMapper;
@@ -238,7 +240,7 @@ public class ResourceRegistryClientImpl implements ResourceRegistryClient {
 			gxHTTPStringRequest.path(typeName);
 			
 			Map<String,String> parameters = new HashMap<>();
-			parameters.put(AccessPath._POLYMORPHIC_PARAM, Boolean.FALSE.toString());
+			parameters.put(InstancePath.POLYMORPHIC_PARAM, Boolean.FALSE.toString());
 			gxHTTPStringRequest.queryParams(parameters);
 			
 			HttpURLConnection httpURLConnection = gxHTTPStringRequest.head();
@@ -285,7 +287,7 @@ public class ResourceRegistryClientImpl implements ResourceRegistryClient {
 			gxHTTPStringRequest.path(typeName);
 			
 			Map<String,String> parameters = new HashMap<>();
-			parameters.put(AccessPath._POLYMORPHIC_PARAM, polymorphic.toString());
+			parameters.put(TypePath.POLYMORPHIC_PARAM, polymorphic.toString());
 			gxHTTPStringRequest.queryParams(parameters);
 			
 			HttpURLConnection httpURLConnection = gxHTTPStringRequest.get();
@@ -330,7 +332,7 @@ public class ResourceRegistryClientImpl implements ResourceRegistryClient {
 			gxHTTPStringRequest.path(type);
 			
 			Map<String,String> parameters = new HashMap<>();
-			parameters.put(AccessPath._POLYMORPHIC_PARAM, polymorphic.toString());
+			parameters.put(InstancePath.POLYMORPHIC_PARAM, polymorphic.toString());
 			includeAdditionalQueryParameters(gxHTTPStringRequest, parameters);
 			
 			HttpURLConnection httpURLConnection = gxHTTPStringRequest.get();