diff --git a/pom.xml b/pom.xml
index a69fbfd..bac1262 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,8 +5,7 @@
     <groupId>eu.dnetlib.dhp</groupId>
     <artifactId>dhp-schemas</artifactId>
     <packaging>jar</packaging>
-    <version>2.11.34-SNAPSHOT</version>
-
+    <version>2.11.34-eosc-SNAPSHOT</version>
 
     <licenses>
         <license>
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 686945a..1f32c33 100644
--- a/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
+++ b/src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java
@@ -175,10 +175,6 @@ 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";