diff --git a/src/main/java/org/gcube/dataharvest/harvester/sobigdata/DataMethodDownloadHarvester.java b/src/main/java/org/gcube/dataharvest/harvester/sobigdata/DataMethodDownloadHarvester.java
index 8e2dc81..040d5f5 100644
--- a/src/main/java/org/gcube/dataharvest/harvester/sobigdata/DataMethodDownloadHarvester.java
+++ b/src/main/java/org/gcube/dataharvest/harvester/sobigdata/DataMethodDownloadHarvester.java
@@ -27,7 +27,7 @@ import org.slf4j.LoggerFactory;
  * @author Eric Perrone (ISTI - CNR)
  * @author Luca Frosini (ISTI - CNR)
  */
-public class DataMethodDownloadHarvester extends BasicHarvester {
+public class DataMethodDownloadHarvester extends SoBigDataHarvester {
 	
 	private static Logger logger = LoggerFactory.getLogger(DataMethodDownloadHarvester.class);
 	
diff --git a/src/main/java/org/gcube/dataharvest/harvester/sobigdata/ResourceCatalogueHarvester.java b/src/main/java/org/gcube/dataharvest/harvester/sobigdata/ResourceCatalogueHarvester.java
index 4151859..c3e0531 100644
--- a/src/main/java/org/gcube/dataharvest/harvester/sobigdata/ResourceCatalogueHarvester.java
+++ b/src/main/java/org/gcube/dataharvest/harvester/sobigdata/ResourceCatalogueHarvester.java
@@ -7,7 +7,6 @@ import java.util.Iterator;
 import java.util.List;
 
 import org.gcube.dataharvest.datamodel.HarvestedData;
-import org.gcube.dataharvest.harvester.BasicHarvester;
 import org.gcube.dataharvest.utils.DateUtils;
 import org.gcube.dataharvest.utils.Utils;
 import org.gcube.portlets.user.urlshortener.UrlEncoderUtil;
@@ -21,7 +20,7 @@ import org.slf4j.LoggerFactory;
  * @author Eric Perrone (ISTI - CNR)
  * @author Luca Frosini (ISTI - CNR)
  */
-public class ResourceCatalogueHarvester extends BasicHarvester {
+public class ResourceCatalogueHarvester extends SoBigDataHarvester {
 	
 	private static Logger logger = LoggerFactory.getLogger(ResourceCatalogueHarvester.class);
 	
@@ -30,6 +29,8 @@ public class ResourceCatalogueHarvester extends BasicHarvester {
 	private int societalDebatesCounter = 0;
 	private int wellBeingAndEconomyCounter = 0;
 	
+	protected List<String> contexts;
+	
 	protected String solrBaseUrl;
 	
 	public ResourceCatalogueHarvester(Date start, Date end) throws ParseException {
@@ -41,6 +42,14 @@ public class ResourceCatalogueHarvester extends BasicHarvester {
 	}
 	
 	
+	public List<String> getContexts() {
+		return contexts;
+	}
+
+	public void setContexts(List<String> contexts) {
+		this.contexts = contexts;
+	}
+	
 	@Override
 	public List<HarvestedData> getData() throws Exception {
 		
diff --git a/src/main/java/org/gcube/dataharvest/harvester/sobigdata/SoBigDataHarvester.java b/src/main/java/org/gcube/dataharvest/harvester/sobigdata/SoBigDataHarvester.java
new file mode 100644
index 0000000..69e8c11
--- /dev/null
+++ b/src/main/java/org/gcube/dataharvest/harvester/sobigdata/SoBigDataHarvester.java
@@ -0,0 +1,14 @@
+package org.gcube.dataharvest.harvester.sobigdata;
+
+import java.text.ParseException;
+import java.util.Date;
+
+import org.gcube.dataharvest.harvester.BasicHarvester;
+
+public abstract class SoBigDataHarvester extends BasicHarvester {
+
+	public SoBigDataHarvester(Date start, Date end) throws ParseException {
+		super(start, end);
+	}
+	
+}