diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/AbstractMdRecordToOafMapper.java b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/AbstractMdRecordToOafMapper.java
index 3519cd88d..73cb1375f 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/AbstractMdRecordToOafMapper.java
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/AbstractMdRecordToOafMapper.java
@@ -12,6 +12,7 @@ import static eu.dnetlib.dhp.oa.graph.raw.common.OafMapperUtils.structuredProper
 
 import eu.dnetlib.dhp.oa.graph.raw.common.MigrationConstants;
 import eu.dnetlib.dhp.schema.oaf.Author;
+import eu.dnetlib.dhp.schema.oaf.Context;
 import eu.dnetlib.dhp.schema.oaf.DataInfo;
 import eu.dnetlib.dhp.schema.oaf.Dataset;
 import eu.dnetlib.dhp.schema.oaf.Field;
@@ -237,11 +238,25 @@ public abstract class AbstractMdRecordToOafMapper {
         r.setContributor(prepareContributors(doc, info));
         r.setResourcetype(prepareResourceType(doc, info));
         r.setCoverage(prepareCoverages(doc, info));
-        r.setContext(new ArrayList<>()); // NOT PRESENT IN MDSTORES
+        r.setContext(prepareContexts(doc, info));
         r.setExternalReference(new ArrayList<>()); // NOT PRESENT IN MDSTORES
         r.setInstance(prepareInstances(doc, info, collectedFrom, hostedBy));
     }
 
+    private List<Context> prepareContexts(final Document doc, final DataInfo info) {
+        final List<Context> list = new ArrayList<>();
+        for (final Object o : doc.selectNodes("//oaf:concept")) {
+            final String cid = ((Node) o).valueOf("@id");
+            if (StringUtils.isNotBlank(cid)) {
+                final Context c = new Context();
+                c.setId(cid);
+                c.setDataInfo(Arrays.asList(info));
+                list.add(c);
+            }
+        }
+        return list;
+    }
+
     protected abstract Qualifier prepareResourceType(Document doc, DataInfo info);
 
     protected abstract List<Instance> prepareInstances(
diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/OdfToOafMapper.java b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/OdfToOafMapper.java
index f6fab499b..6ac5dd487 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/OdfToOafMapper.java
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/OdfToOafMapper.java
@@ -1,8 +1,19 @@
 package eu.dnetlib.dhp.oa.graph.raw;
 
-import static eu.dnetlib.dhp.oa.graph.raw.common.OafMapperUtils.*;
+import static eu.dnetlib.dhp.oa.graph.raw.common.OafMapperUtils.createOpenaireId;
+import static eu.dnetlib.dhp.oa.graph.raw.common.OafMapperUtils.field;
+import static eu.dnetlib.dhp.oa.graph.raw.common.OafMapperUtils.structuredProperty;
 
-import eu.dnetlib.dhp.schema.oaf.*;
+import eu.dnetlib.dhp.schema.oaf.Author;
+import eu.dnetlib.dhp.schema.oaf.DataInfo;
+import eu.dnetlib.dhp.schema.oaf.Field;
+import eu.dnetlib.dhp.schema.oaf.GeoLocation;
+import eu.dnetlib.dhp.schema.oaf.Instance;
+import eu.dnetlib.dhp.schema.oaf.KeyValue;
+import eu.dnetlib.dhp.schema.oaf.Oaf;
+import eu.dnetlib.dhp.schema.oaf.Qualifier;
+import eu.dnetlib.dhp.schema.oaf.Relation;
+import eu.dnetlib.dhp.schema.oaf.StructuredProperty;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -62,33 +73,44 @@ public class OdfToOafMapper extends AbstractMdRecordToOafMapper {
             final DataInfo info,
             final KeyValue collectedfrom,
             final KeyValue hostedby) {
-        final List<Instance> res = new ArrayList<>();
+
+        final Instance instance = new Instance();
+        instance.setUrl(new ArrayList<>());
+        instance.setInstancetype(
+                prepareQualifier(
+                        doc,
+                        "//dr:CobjCategory",
+                        "dnet:publication_resource",
+                        "dnet:publication_resource"));
+        instance.setCollectedfrom(collectedfrom);
+        instance.setHostedby(hostedby);
+        instance.setDateofacceptance(field(doc.valueOf("//oaf:dateAccepted"), info));
+        instance.setDistributionlocation(doc.valueOf("//oaf:distributionlocation"));
+        instance.setAccessright(
+                prepareQualifier(
+                        doc, "//oaf:accessrights", "dnet:access_modes", "dnet:access_modes"));
+        instance.setLicense(field(doc.valueOf("//oaf:license"), info));
+        instance.setRefereed(field(doc.valueOf("//oaf:refereed"), info));
+        instance.setProcessingchargeamount(
+                field(doc.valueOf("//oaf:processingchargeamount"), info));
+        instance.setProcessingchargecurrency(
+                field(doc.valueOf("//oaf:processingchargeamount/@currency"), info));
+
         for (final Object o :
                 doc.selectNodes("//datacite:alternateIdentifier[@alternateIdentifierType='URL']")) {
-            final Instance instance = new Instance();
-            instance.setUrl(Arrays.asList(((Node) o).getText().trim()));
-            instance.setInstancetype(
-                    prepareQualifier(
-                            doc,
-                            "//dr:CobjCategory",
-                            "dnet:publication_resource",
-                            "dnet:publication_resource"));
-            instance.setCollectedfrom(collectedfrom);
-            instance.setHostedby(hostedby);
-            instance.setDateofacceptance(field(doc.valueOf("//oaf:dateAccepted"), info));
-            instance.setDistributionlocation(doc.valueOf("//oaf:distributionlocation"));
-            instance.setAccessright(
-                    prepareQualifier(
-                            doc, "//oaf:accessrights", "dnet:access_modes", "dnet:access_modes"));
-            instance.setLicense(field(doc.valueOf("//oaf:license"), info));
-            instance.setRefereed(field(doc.valueOf("//oaf:refereed"), info));
-            instance.setProcessingchargeamount(
-                    field(doc.valueOf("//oaf:processingchargeamount"), info));
-            instance.setProcessingchargecurrency(
-                    field(doc.valueOf("//oaf:processingchargeamount/@currency"), info));
-            res.add(instance);
+            instance.getUrl().add(((Node) o).getText().trim());
         }
-        return res;
+        for (final Object o : doc.selectNodes("//datacite:identifier[@identifierType='URL']")) {
+            instance.getUrl().add(((Node) o).getText().trim());
+        }
+        for (final Object o :
+                doc.selectNodes("//datacite:alternateIdentifier[@alternateIdentifierType='DOI']")) {
+            instance.getUrl().add("http://dx.doi.org/" + ((Node) o).getText().trim());
+        }
+        for (final Object o : doc.selectNodes("//datacite:identifier[@identifierType='DOI']")) {
+            instance.getUrl().add("http://dx.doi.org/" + ((Node) o).getText().trim());
+        }
+        return Arrays.asList(instance);
     }
 
     @Override
diff --git a/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/raw/MappersTest.java b/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/raw/MappersTest.java
index b09c5d638..5b445a1ef 100644
--- a/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/raw/MappersTest.java
+++ b/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/raw/MappersTest.java
@@ -54,6 +54,7 @@ public class MappersTest {
         assertTrue(p.getSubject().size() > 0);
         assertTrue(StringUtils.isNotBlank(p.getJournal().getIssnOnline()));
         assertTrue(StringUtils.isNotBlank(p.getJournal().getName()));
+        assertTrue(p.getInstance().size() > 0);
 
         assertValidId(r1.getSource());
         assertValidId(r1.getTarget());
@@ -96,6 +97,9 @@ public class MappersTest {
         assertTrue(StringUtils.isNotBlank(d.getTitle().get(0).getValue()));
         assertTrue(d.getAuthor().size() > 0);
         assertTrue(d.getSubject().size() > 0);
+        assertTrue(d.getInstance().size() > 0);
+        assertTrue(d.getContext().size() > 0);
+        assertTrue(d.getContext().get(0).getId().length() > 0);
 
         assertValidId(r1.getSource());
         assertValidId(r1.getTarget());
@@ -129,6 +133,7 @@ public class MappersTest {
         assertTrue(StringUtils.isNotBlank(s.getTitle().get(0).getValue()));
         assertTrue(s.getAuthor().size() > 0);
         assertTrue(s.getSubject().size() > 0);
+        assertTrue(s.getInstance().size() > 0);
     }
 
     private void assertValidId(final String id) {