diff --git a/CHANGELOG.md b/CHANGELOG.md
index 95220a9..c08c92f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,16 +2,23 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 # Changelog for Resource Registry Client
 
+## [v4.2.0-SNAPSHOT]
+
+- Aligned APIs to other clients [#22011]
+
+
 ## [v4.1.0] 
 
 - Used ContextCache to make the client more efficient
 - Added APIs to get instance contexts [#20013]
 - Added support to request contexts in instances header [#20012]
 
+
 ## [v4.0.0] [r4.26.0] - 2020-11-11 
 
 - Switched JSON management to gcube-jackson [#19116]
 
+
 ## [v3.0.0] [r4.21.0] - 2020-03-30
 
 - Refactored code to support IS Model reorganization (e.g naming, packages)
diff --git a/pom.xml b/pom.xml
index c989c3d..6601ed4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -9,7 +9,7 @@
 
 	<groupId>org.gcube.information-system</groupId>
 	<artifactId>resource-registry-client</artifactId>
-	<version>4.1.0</version>
+	<version>4.2.0-SNAPSHOT</version>
 	<name>Resource Registry Client</name>
 	<description>Resource Registry Client is a library designed to interact with idempotent Resource Registry APIs</description>
 
diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/client/ResourceRegistryClient.java b/src/main/java/org/gcube/informationsystem/resourceregistry/client/ResourceRegistryClient.java
index 5998c82..58391b1 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/client/ResourceRegistryClient.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/client/ResourceRegistryClient.java
@@ -5,7 +5,6 @@ import java.util.Map;
 import java.util.Set;
 import java.util.UUID;
 
-import org.gcube.informationsystem.base.reference.Element;
 import org.gcube.informationsystem.context.reference.entities.Context;
 import org.gcube.informationsystem.model.reference.ERElement;
 import org.gcube.informationsystem.model.reference.entities.Facet;
@@ -82,34 +81,13 @@ public interface ResourceRegistryClient {
 	public String getRelatedResources(String resourceType, String isRelatedToType, String referenceResourceType,
 			Direction direction, boolean polymorphic) throws ResourceRegistryException;
 	
-	/*
-	public <E extends Entity, R extends Relation<?,?>, RE extends Entity> List<E> getRelated(Class<E> entityClass,
-			Class<R> relationClass, Class<RE> referenceEntityClass, Direction direction, boolean polymorphic,
-			Map<String,Object> map) throws ResourceRegistryException;
-	
-	public String getRelated(String entityType, String relationType, String referenceEntityType, Direction direction,
-			boolean polymorphic, Map<String,Object> map) throws ResourceRegistryException;
-	
-	public <E extends Entity, R extends Relation<?,?>, RE extends Entity> List<E> getRelated(Class<E> entityClass,
-			Class<R> relationClass, Class<RE> referenceEntityClass, RE referenceEntity, Direction direction,
-			boolean polymorphic) throws ResourceRegistryException;
-	
-	public <E extends Entity, R extends Relation<?,?>, RE extends Entity> List<E> getRelated(Class<E> entityClass,
-			Class<R> relationClass, Class<RE> referenceEntityClass, UUID referenceEntityUUID, Direction direction,
-			boolean polymorphic) throws ResourceRegistryException;
-	
-	public String getRelated(String entityType, String relationType, String referenceEntityType, UUID referenceEntity,
-			Direction direction, boolean polymorphic) throws ResourceRegistryException;
-	*/
-	
-	
 	public String query(final String query, final int limit, final String fetchPlan)
 			throws InvalidQueryException, ResourceRegistryException;
 	
 	public String query(final String query, final int limit, final String fetchPlan, boolean raw)
 			throws InvalidQueryException, ResourceRegistryException;
 	
-	public <E extends Element> List<Type> getSchema(Class<E> clazz, Boolean polymorphic)
+	public <ERElem extends ERElement> List<Type> getSchema(Class<ERElem> clazz, Boolean polymorphic)
 			throws SchemaNotFoundException, ResourceRegistryException;
 	
 	public Context getContext(UUID uuid) throws ContextNotFoundException, ResourceRegistryException;
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 47d360e..8d4de09 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/client/ResourceRegistryClientImpl.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/client/ResourceRegistryClientImpl.java
@@ -10,7 +10,6 @@ import java.util.UUID;
 
 import org.gcube.common.gxhttp.reference.GXConnection;
 import org.gcube.common.gxhttp.request.GXHTTPStringRequest;
-import org.gcube.informationsystem.base.reference.Element;
 import org.gcube.informationsystem.context.reference.entities.Context;
 import org.gcube.informationsystem.model.reference.ERElement;
 import org.gcube.informationsystem.model.reference.entities.Entity;
@@ -183,7 +182,7 @@ public class ResourceRegistryClientImpl implements ResourceRegistryClient {
 	}
 	
 	@Override
-	public <E extends Element> List<Type> getSchema(Class<E> clazz, Boolean polymorphic)
+	public <ERElem extends ERElement> List<Type> getSchema(Class<ERElem> clazz, Boolean polymorphic)
 			throws SchemaNotFoundException, ResourceRegistryException {
 		String type = Utility.getTypeName(clazz);
 		try {