dhp-workflows/dhp-graph-provision/src/main/java/eu/dnetlib/dhp/oa/provision/model/ProvisionModelSupport.java

@@ -687,6 +687,7 @@ public class ProvisionModelSupport {
 					.stream()
 					.filter(s -> Objects.nonNull(s.getQualifier()))
 					.filter(s -> Objects.nonNull(s.getQualifier().getClassname()))
+					.filter(ProvisionModelSupport::filterFosL1L2)
 					.map(
 						s -> Subject
 							.newInstance(s.getValue(), s.getQualifier().getClassid(), s.getQualifier().getClassname()))
@@ -709,6 +710,16 @@ public class ProvisionModelSupport {
 			.orElse(null);
 	}
 
+	public static boolean filterFosL1L2(StructuredProperty s) {
+		final String subjectType = Optional.ofNullable(s.getQualifier()).map(Qualifier::getClassid).orElse("");
+		if (ModelConstants.DNET_SUBJECT_FOS_CLASSID.equals(subjectType)) {
+			String code = StringUtils.substringBefore(s.getValue(), " ");
+			return code.matches("^\\d{2}$|^\\d{4}$");
+		}
+
+		return true;
+	}
+
 	private static Country asCountry(eu.dnetlib.dhp.schema.oaf.Qualifier country) {
 		return Optional
 			.ofNullable(country)

dhp-workflows/dhp-graph-provision/src/main/java/eu/dnetlib/dhp/oa/provision/utils/XmlRecordFactory.java

@@ -20,6 +20,7 @@ import javax.xml.transform.*;
 import javax.xml.transform.dom.DOMSource;
 import javax.xml.transform.stream.StreamResult;
 
+import eu.dnetlib.dhp.oa.provision.model.*;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.tuple.ImmutablePair;
 import org.apache.commons.lang3.tuple.Pair;
@@ -41,10 +42,6 @@ import com.google.common.collect.Sets;
 import com.mycila.xmltool.XMLDoc;
 import com.mycila.xmltool.XMLTag;
 
-import eu.dnetlib.dhp.oa.provision.model.JoinedEntity;
-import eu.dnetlib.dhp.oa.provision.model.RelatedEntity;
-import eu.dnetlib.dhp.oa.provision.model.RelatedEntityWrapper;
-import eu.dnetlib.dhp.oa.provision.model.XmlInstance;
 import eu.dnetlib.dhp.schema.common.*;
 import eu.dnetlib.dhp.schema.oaf.*;
 import eu.dnetlib.dhp.schema.oaf.Result;
@@ -389,6 +386,7 @@ public class XmlRecordFactory implements Serializable {
 							.getSubject()
 							.stream()
 							.filter(Objects::nonNull)
+							.filter(ProvisionModelSupport::filterFosL1L2)
 							.map(s -> XmlSerializationUtils.mapStructuredProperty("subject", s))
 							.collect(Collectors.toList()));
 			}

dhp-workflows/dhp-graph-provision/src/main/java/eu/dnetlib/dhp/oa/provision/utils/XmlSerializationUtils.java

@@ -5,11 +5,7 @@ import static eu.dnetlib.dhp.oa.provision.utils.GraphMappingUtils.removePrefix;
 import static org.apache.commons.lang3.StringUtils.isBlank;
 import static org.apache.commons.lang3.StringUtils.isNotBlank;
 
-import java.util.HashSet;
 import java.util.List;
-import java.util.Optional;
-import java.util.Set;
-import java.util.stream.Collectors;
 
 import org.apache.commons.lang3.StringUtils;
 

dhp-workflows/dhp-graph-provision/src/test/java/eu/dnetlib/dhp/oa/provision/XmlRecordFactoryTest.java

@@ -97,6 +97,8 @@ public class XmlRecordFactoryTest {
 		assertEquals("bronze", doc.valueOf("//*[local-name() = 'result']/openaccesscolor/text()"));
 		assertEquals("true", doc.valueOf("//*[local-name() = 'result']/isindiamondjournal/text()"));
 		assertEquals("true", doc.valueOf("//*[local-name() = 'result']/publiclyfunded/text()"));
+
+		assertEquals(15, doc.selectNodes("//*[local-name() = 'result']/*[local-name() = 'subject']").size());
 	}
 
 	@Test

dhp-workflows/dhp-graph-provision/src/test/resources/eu/dnetlib/dhp/oa/provision/publication.json

@@ -1886,12 +1886,34 @@
         "trust": ""
       },
       "qualifier": {
-        "classid": "keyword",
+        "classid": "FOS",
-        "classname": "keyword",
+        "classname": "Fields of Science and Technology classification",
         "schemeid": "dnet:subject_classification_typologies",
         "schemename": "dnet:subject_classification_typologies"
       },
-      "value": "Thermal conductivity"
+      "value": "0101 mathematics"
+    },
+    {
+      "dataInfo": {
+        "deletedbyinference": false,
+        "inferenceprovenance": "",
+        "inferred": false,
+        "invisible": false,
+        "provenanceaction": {
+          "classid": "",
+          "classname": "",
+          "schemeid": "",
+          "schemename": ""
+        },
+        "trust": ""
+      },
+      "qualifier": {
+        "classid": "FOS",
+        "classname": "Fields of Science and Technology classification",
+        "schemeid": "dnet:subject_classification_typologies",
+        "schemename": "dnet:subject_classification_typologies"
+      },
+      "value": "010101 applied mathematics"
     }
   ],
   "title": [