From f9f64ba93f3cd6ebd91a5358cfe0ba340b722667 Mon Sep 17 00:00:00 2001
From: "michele.artini" <michele.artini@isti.cnr.it>
Date: Wed, 13 Oct 2021 11:29:32 +0200
Subject: [PATCH] add parent/child rels

---
 .../java/eu/dnetlib/dhp/schema/common/ModelConstants.java     | 4 ++++
 1 file changed, 4 insertions(+)

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 5c08765..ed9bf48 100644
--- a/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
+++ b/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
@@ -148,6 +148,10 @@ public class ModelConstants {
 
 	public static final String IS_DIFFERENT_FROM = "isDifferentFrom";
 
+	public static final String HIERARCHY = "hierarchy"; // subreltype
+	public static final String IS_PARENT_OF = "isParentOf";
+	public static final String IS_CHILD_OF = "isChildOf";
+
 	public static final String UNKNOWN = "UNKNOWN";
 	public static final String NOT_AVAILABLE = "not available";