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 1aba2eb..ffe22d7 100644
--- a/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
+++ b/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
@@ -10,6 +10,7 @@ public class ModelConstants {
 	public static final String ORCID = "orcid";
 	public static final String ORCID_PENDING = "orcid_pending";
 	public static final String ORCID_CLASSNAME = "Open Researcher and Contributor ID";
+	public static final String ORCID_DS = ORCID.toUpperCase();
 
 	public static final String DNET_SUBJECT_TYPOLOGIES = "dnet:subject_classification_typologies";
 	public static final String DNET_RESULT_TYPOLOGIES = "dnet:result_typologies";