diff --git a/CHANGES.md b/CHANGES.md
index 953d9df..bc32ae8 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -4,6 +4,7 @@
 
 | **Version** | **Changes** | **Readiness** |
 |---|---|---|
+| 2.9.23 | [Graph model]<br>Added Instance.measures field, allowing to maintain the association between them and the individual result instance</br>[Dump model]</br>added json schemas | beta |
 | 2.8.22 | [Graph model]<br>minor: added serializable to the Measures model class</br>[Dump model]</br>added dedicated BestAccessRight class, used at the result level instead of AccessRight | beta |
 | 2.8.21 | [Graph model]<br>added the following relation terms Describes/IsDescribedBy, IsMetadataFor/IsMetadataOf, HasAssociationWith/HasAssociationWith, IsRequiredBy/Requires. All these are used in combination with the relation subRelType "relationship" | beta |
 | 2.8.20 | [Graph model]<br>added constants declaring the values used for hierarchical relationships among the organizations IsParentOf / IsChildOf | beta |
diff --git a/pom.xml b/pom.xml
index 663ea6e..812cf8f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
     <groupId>eu.dnetlib.dhp</groupId>
     <artifactId>dhp-schemas</artifactId>
     <packaging>jar</packaging>
-    <version>2.8.23-SNAPSHOT</version>
+    <version>2.9.23-SNAPSHOT</version>
 
     <licenses>
         <license>
@@ -32,7 +32,7 @@
         <connection>scm:git:gitea@code-repo.d4science.org:D-Net/dhp-schemas.git</connection>
         <developerConnection>scm:git:gitea@code-repo.d4science.org:D-Net/dhp-schemas.git</developerConnection>
         <url>https://code-repo.d4science.org/D-Net/dhp-schemas/</url>
-        <tag>dhp-schemas-2.8.20</tag>
+        <tag>dhp-schemas-2.9.23</tag>
     </scm>
 
     <description>This module contains common schema classes meant to be used across the dnet-hadoop submodules</description>
diff --git a/src/main/java/eu/dnetlib/dhp/schema/oaf/Instance.java b/src/main/java/eu/dnetlib/dhp/schema/oaf/Instance.java
index c4cde0c..6bb2908 100644
--- a/src/main/java/eu/dnetlib/dhp/schema/oaf/Instance.java
+++ b/src/main/java/eu/dnetlib/dhp/schema/oaf/Instance.java
@@ -37,6 +37,8 @@ public class Instance implements Serializable {
 
 	private Qualifier refereed; // peer-review status
 
+	private List<Measure> measures;
+
 	public Field<String> getLicense() {
 		return license;
 	}
@@ -141,6 +143,14 @@ public class Instance implements Serializable {
 		this.refereed = refereed;
 	}
 
+	public List<Measure> getMeasures() {
+		return measures;
+	}
+
+	public void setMeasures(List<Measure> measures) {
+		this.measures = measures;
+	}
+
 	public String toComparableString() {
 		return String
 			.format(