diff --git a/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java b/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
index b5535fa..ebab4c7 100644
--- a/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
+++ b/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
@@ -1,7 +1,10 @@
 
 package eu.dnetlib.dhp.schema.common;
 
-import eu.dnetlib.dhp.schema.oaf.*;
+import eu.dnetlib.dhp.schema.oaf.AccessRight;
+import eu.dnetlib.dhp.schema.oaf.DataInfo;
+import eu.dnetlib.dhp.schema.oaf.KeyValue;
+import eu.dnetlib.dhp.schema.oaf.Qualifier;
 
 public class ModelConstants {
 
@@ -21,6 +24,9 @@ public class ModelConstants {
 
 	// VOCABULARY VALUE
 	public static final String ACCESS_RIGHT_OPEN = "OPEN";
+	public static final String ACCESS_RIGHT_EMBARGO = "EMBARGO";
+	public static final String ACCESS_RIGHT_CLOSED = "CLOSED";
+
 
 	public static final String DNET_SUBJECT_TYPOLOGIES = "dnet:subject_classification_typologies";
 	public static final String DNET_RESULT_TYPOLOGIES = "dnet:result_typologies";
@@ -194,8 +200,8 @@ public class ModelConstants {
 		return q;
 	}
 
-	private static KeyValue keyValue(String key, String value) {
-		KeyValue kv = new KeyValue();
+	private static KeyValue keyValue(final String key, final String value) {
+		final KeyValue kv = new KeyValue();
 		kv.setKey(key);
 		kv.setValue(value);
 		kv.setDataInfo(new DataInfo());