WIP: pruning out non necessary fields from the internal model

src/main/java/eu/dnetlib/dhp/schema/oaf/Relation.java

@@ -51,17 +51,7 @@ public class Relation extends Oaf implements Serializable {
 	private String validationDate;
 
 	private List<Provenance> provenance;
-
-	private DataInfo dataInfo;
-
-	public DataInfo getDataInfo() {
-		return dataInfo;
-	}
-
-	public void setDataInfo(DataInfo dataInfo) {
-		this.dataInfo = dataInfo;
-	}
-
+	
 	/**
 	 * List of relation specific properties. Values include 'similarityLevel', indicating the similarity score between a
 	 * pair of publications.