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 e9261dc..d609d9c 100644
--- a/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
+++ b/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
@@ -27,6 +27,9 @@ public class ModelConstants {
 
 	public static final String OPENORGS_NAME = "OpenOrgs Database";
 
+	public static final String OPENOCITATIONS_NAME = "OpenCitations";
+	public static final String OPENOCITATIONS_ID = "10|openaire____::c06df618c5de1c786535ccf3f8b7b059";
+
 	// VOCABULARY VALUE
 	public static final String ACCESS_RIGHT_OPEN = "OPEN";
 	public static final String ACCESS_RIGHT_EMBARGO = "EMBARGO";