diff --git a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Measure.java b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Measure.java
index 98adffd2a0..c37e760618 100644
--- a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Measure.java
+++ b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Measure.java
@@ -1,4 +1,56 @@
 package eu.dnetlib.dhp.schema.oaf;
 
+import com.google.common.base.Objects;
+
+import java.util.List;
+
+/**
+ * Represent a measure, must be further described by a system available resource providing name and descriptions.
+ */
 public class Measure {
+
+    /**
+     * Unique measure identifier.
+     */
+    private String id;
+
+    /**
+     * List of units associated with this measure. KeyValue provides a pair to store the laber (key) and the value,
+     * plus common provenance information.
+     */
+    private List<KeyValue> unit;
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public List<KeyValue> getUnit() {
+        return unit;
+    }
+
+    public void setUnit(List<KeyValue> unit) {
+        this.unit = unit;
+    }
+
+    public void mergeFrom(Measure m) {
+        //TODO
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Measure measure = (Measure) o;
+        return Objects.equal(id, measure.id) &&
+                Objects.equal(unit, measure.unit);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(id, unit);
+    }
 }
diff --git a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Relation.java b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Relation.java
index 76503f8853..d77bd7d733 100644
--- a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Relation.java
+++ b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Relation.java
@@ -40,6 +40,21 @@ public class Relation extends Oaf {
 	 */
 	private String target;
 
+	/**
+	 * Was this relationship authoritatively validated?
+	 */
+	private Boolean validated;
+
+	/**
+	 * When was this relationship authoritatively validated.
+	 */
+	private String validationDate;
+
+	/**
+	 * List of relation specific properties. Values include 'similarityLevel', indicating the similarity score between a pair of publications.
+	 */
+	private List<KeyValue> properties = new ArrayList<>();
+
 	public String getRelType() {
 		return relType;
 	}
@@ -80,6 +95,30 @@ public class Relation extends Oaf {
 		this.target = target;
 	}
 
+	public List<KeyValue> getProperties() {
+		return properties;
+	}
+
+	public void setProperties(List<KeyValue> properties) {
+		this.properties = properties;
+	}
+
+	public Boolean getValidated() {
+		return validated;
+	}
+
+	public void setValidated(Boolean validated) {
+		this.validated = validated;
+	}
+
+	public String getValidationDate() {
+		return validationDate;
+	}
+
+	public void setValidationDate(String validationDate) {
+		this.validationDate = validationDate;
+	}
+
 	public void mergeFrom(final Relation r) {
 
 		checkArgument(Objects.equals(getSource(), r.getSource()), "source ids must be equal");
@@ -122,4 +161,5 @@ public class Relation extends Oaf {
 	public int hashCode() {
 		return Objects.hash(relType, subRelType, relClass, source, target, collectedfrom);
 	}
+
 }
diff --git a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Result.java b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Result.java
index 711b1ca681..11316f36e4 100644
--- a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Result.java
+++ b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Result.java
@@ -7,6 +7,8 @@ import java.util.List;
 
 public class Result extends OafEntity implements Serializable {
 
+	private List<Measure> measures;
+
 	private List<Author> author;
 
 	// resulttype allows subclassing results into publications | datasets | software
@@ -51,6 +53,14 @@ public class Result extends OafEntity implements Serializable {
 
 	private List<Instance> instance;
 
+	public List<Measure> getMeasures() {
+		return measures;
+	}
+
+	public void setMeasures(List<Measure> measures) {
+		this.measures = measures;
+	}
+
 	public List<Author> getAuthor() {
 		return author;
 	}
@@ -229,6 +239,8 @@ public class Result extends OafEntity implements Serializable {
 
 		Result r = (Result) e;
 
+		//TODO consider merging also Measures
+
 		instance = mergeLists(instance, r.getInstance());
 
 		if (r.getBestaccessright() != null && compareTrust(this, r) < 0)
diff --git a/dhp-schemas/src/test/java/eu/dnetlib/dhp/schema/oaf/MeasureTest.java b/dhp-schemas/src/test/java/eu/dnetlib/dhp/schema/oaf/MeasureTest.java
index 26376349c7..25d929db22 100644
--- a/dhp-schemas/src/test/java/eu/dnetlib/dhp/schema/oaf/MeasureTest.java
+++ b/dhp-schemas/src/test/java/eu/dnetlib/dhp/schema/oaf/MeasureTest.java
@@ -1,4 +1,41 @@
 package eu.dnetlib.dhp.schema.oaf;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.common.collect.Lists;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+
 public class MeasureTest {
+
+    public static final ObjectMapper OBJECT_MAPPER = new ObjectMapper()
+            .setSerializationInclusion(JsonInclude.Include.NON_NULL);
+
+    @Test
+    public void testMeasureSerialization() throws IOException {
+
+        Measure m = new Measure();
+
+        m.setId("popularity");
+        m.setUnit(Lists.newArrayList(
+                unit("score", "0.5")));
+
+        String s = OBJECT_MAPPER.writeValueAsString(m);
+        System.out.println(s);
+
+        Measure mm = OBJECT_MAPPER.readValue(s, Measure.class);
+
+        Assertions.assertNotNull(mm);
+    }
+
+    private KeyValue unit(String key, String value) {
+        KeyValue unit = new KeyValue();
+        unit.setKey(key);
+        unit.setValue(value);
+        return unit;
+    }
+
 }