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 4edd7c9..094e61f 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/client/ResourceRegistryClient.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/client/ResourceRegistryClient.java
@@ -21,16 +21,13 @@ import org.gcube.informationsystem.resourceregistry.api.exceptions.contexts.Cont
 import org.gcube.informationsystem.resourceregistry.api.exceptions.queries.InvalidQueryException;
 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.request.RequestInfo;
 import org.gcube.informationsystem.types.reference.Type;
 
 /**
  * @author Luca Frosini (ISTI - CNR)
  */
-public interface ResourceRegistryClient {
-
-	public boolean isHierarchicalMode();
-
-	public void setHierarchicalMode(boolean hierarchicalMode);
+public interface ResourceRegistryClient extends RequestInfo {
 
 	/**
 	 * Use {@link #includeContexts()} instead
@@ -46,10 +43,6 @@ public interface ResourceRegistryClient {
 	@Deprecated
 	public void setIncludeContextsInHeader(boolean includeContexts);
 	
-	public boolean includeContexts();
-
-	public void includeContexts(boolean includeContexts);
-
 	public void addHeader(String name, String value);
 	
 	
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 2e53ab0..73b8b11 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/client/ResourceRegistryClientImpl.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/client/ResourceRegistryClientImpl.java
@@ -15,11 +15,13 @@ import org.gcube.common.gxhttp.reference.GXConnection;
 import org.gcube.common.gxhttp.request.GXHTTPStringRequest;
 import org.gcube.common.http.GXHTTPUtility;
 import org.gcube.informationsystem.base.reference.Direction;
+import org.gcube.informationsystem.base.reference.IdentifiableElement;
 import org.gcube.informationsystem.contexts.reference.entities.Context;
 import org.gcube.informationsystem.model.reference.ERElement;
 import org.gcube.informationsystem.model.reference.entities.Entity;
 import org.gcube.informationsystem.model.reference.entities.Facet;
 import org.gcube.informationsystem.model.reference.entities.Resource;
+import org.gcube.informationsystem.model.reference.properties.Metadata;
 import org.gcube.informationsystem.model.reference.relations.ConsistsOf;
 import org.gcube.informationsystem.model.reference.relations.IsRelatedTo;
 import org.gcube.informationsystem.model.reference.relations.Relation;
@@ -61,9 +63,27 @@ public class ResourceRegistryClientImpl implements ResourceRegistryClient {
 	
 	protected Map<String, String> headers;
 	
+	/**
+	 * Track if the client must request the hierarchicalMode 
+	 */
 	protected boolean hierarchicalMode;
+	
+	/**
+	 * Track if the client must request to include contexts
+	 */
 	protected boolean includeContexts;
 	
+	/**
+	 * Track if the client must request to include {@link Metadata} 
+	 */
+	protected boolean includeMeta;
+	
+	/**
+	 * Track if the client must request to include {@link Metadata} in all
+	 * {@link IdentifiableElement} or just in the root instance 
+	 */
+	protected boolean allMeta;
+	
 	protected ContextCache contextCache;
 	
 	@Override
@@ -85,7 +105,7 @@ public class ResourceRegistryClientImpl implements ResourceRegistryClient {
 	@Deprecated
 	@Override
 	public void setIncludeContextsInHeader(boolean includeContexts) {
-		includeContexts(includeContexts);
+		setIncludeContexts(includeContexts);
 	}
 	
 	@Override
@@ -94,37 +114,69 @@ public class ResourceRegistryClientImpl implements ResourceRegistryClient {
 	}
 	
 	@Override
-	public void includeContexts(boolean includeContexts) {
+	public void setIncludeContexts(boolean includeContexts) {
 		this.includeContexts = includeContexts;
 	}
 
+	public boolean includeMeta() {
+		return includeMeta;
+	}
+
+	public void setIncludeMeta(boolean includeMeta) {
+		this.includeMeta = includeMeta;
+	}
+
+	public boolean allMeta() {
+		return allMeta;
+	}
+
+	public void setAllMeta(boolean allMeta) {
+		this.allMeta = allMeta;
+	}
+	
+	
+	private void addOptionalQueryParameters(Map<String,String> queryParams) throws UnsupportedEncodingException {
+		addHierarchicalMode(queryParams);
+		addIncludeContexts(queryParams);
+		addIncludeMeta(queryParams);
+		addIncludeAllMeta(queryParams);
+	}
+	
 	private GXHTTPStringRequest includeAdditionalQueryParameters(GXHTTPStringRequest gxHTTPStringRequest) throws UnsupportedEncodingException{
-		return includeAdditionalQueryParameters(gxHTTPStringRequest, null);
+		Map<String,String> queryParams = new HashMap<>();
+		return includeAdditionalQueryParameters(gxHTTPStringRequest, queryParams);
 	}
 	
 	private GXHTTPStringRequest includeAdditionalQueryParameters(GXHTTPStringRequest gxHTTPStringRequest, Map<String,String> queryParams) throws UnsupportedEncodingException{
-		gxHTTPStringRequest = checkHierarchicalMode(gxHTTPStringRequest, queryParams);
-		return checkIncludeContextsInInstance(gxHTTPStringRequest, queryParams);
+		if(queryParams==null) {
+			queryParams = new HashMap<>();
+		}
+		addOptionalQueryParameters(queryParams);
+		return gxHTTPStringRequest.queryParams(queryParams);
 	}
 	
-	private GXHTTPStringRequest checkHierarchicalMode(GXHTTPStringRequest gxHTTPStringRequest, Map<String,String> queryParams) throws UnsupportedEncodingException{
+	private void addHierarchicalMode(Map<String,String> queryParams) throws UnsupportedEncodingException{
 		if(hierarchicalMode) {
-			if(queryParams==null) {
-				queryParams = new HashMap<>();
-			}
 			queryParams.put(AccessPath.HIERARCHICAL_MODE_QUERY_PARAMETER, Boolean.toString(hierarchicalMode));
 		}
-		return gxHTTPStringRequest.queryParams(queryParams);
 	}
 	
-	private GXHTTPStringRequest checkIncludeContextsInInstance(GXHTTPStringRequest gxHTTPStringRequest, Map<String,String> queryParams) throws UnsupportedEncodingException{
+	private void addIncludeContexts(Map<String,String> queryParams) throws UnsupportedEncodingException{
 		if(includeContexts) {
-			if(queryParams==null) {
-				queryParams = new HashMap<>();
-			}
 			queryParams.put(AccessPath.INCLUDE_CONTEXTS_QUERY_PARAMETER, Boolean.toString(includeContexts));
 		}
-		return gxHTTPStringRequest.queryParams(queryParams);
+	}
+	
+	private void addIncludeMeta(Map<String,String> queryParams) throws UnsupportedEncodingException{
+		if(includeMeta) {
+			queryParams.put(AccessPath.INCLUDE_META_QUERY_PARAMETER, Boolean.toString(includeMeta));
+		}
+	}
+	
+	private void addIncludeAllMeta(Map<String,String> queryParams) throws UnsupportedEncodingException{
+		if(allMeta) {
+			queryParams.put(AccessPath.INCLUDE_META_IN_ALL_INSTANCES_QUERY_PARAMETER, Boolean.toString(allMeta));
+		}
 	}
 	
 	protected ContextCacheRenewal contextCacheRenewal = new ContextCacheRenewal() {
@@ -158,6 +210,8 @@ public class ResourceRegistryClientImpl implements ResourceRegistryClient {
 		this.address = address;
 		this.hierarchicalMode = false;
 		this.includeContexts = false;
+		this.includeMeta = false;
+		this.allMeta = false;
 		this.headers = new HashMap<>();
 		if(sharedContextCache) {
 			contextCache = ContextCache.getInstance();
@@ -427,7 +481,9 @@ public class ResourceRegistryClientImpl implements ResourceRegistryClient {
 			gxHTTPStringRequest.path(type);
 			gxHTTPStringRequest.path(uuid.toString());
 			
-			includeAdditionalQueryParameters(gxHTTPStringRequest);
+			Map<String,String> queryParams =  new HashMap<>();
+			addHierarchicalMode(queryParams);
+			gxHTTPStringRequest.queryParams(queryParams);
 			
 			HttpURLConnection httpURLConnection = gxHTTPStringRequest.head();
 			HTTPUtility.getResponse(String.class, httpURLConnection);
@@ -507,7 +563,12 @@ public class ResourceRegistryClientImpl implements ResourceRegistryClient {
 			parameters.put(AccessPath.Q_QUERY_PARAMETER, query);
 			parameters.put(AccessPath.RAW_QUERY_PARAMETER, Boolean.toString(raw));
 			
-			includeAdditionalQueryParameters(gxHTTPStringRequest, parameters);
+			if(raw) {
+				addHierarchicalMode(parameters);
+				gxHTTPStringRequest.queryParams(parameters);
+			} else {
+				includeAdditionalQueryParameters(gxHTTPStringRequest, parameters);
+			}
 			
 			HttpURLConnection httpURLConnection = gxHTTPStringRequest.get();