--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/access/SQRelationAccess.java	Wed Jun 06 14:17:18 2018 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/access/SQRelationAccess.java	Wed Jun 06 14:24:51 2018 +0200
@@ -22,18 +22,15 @@
 {
     private static Logger log = Logger.getLogger(SQRelationAccess.class);
 
-    protected Double    location;
+    private Double    location;
 
-    protected DateRange period;
+    private DateRange period;
 
-    protected Double    outliers;
+    private Double    outliers;
 
     private String      method;
 
-    protected MeasurementStation measurementStation;
-
-    public SQRelationAccess() {
-    }
+    private MeasurementStation measurementStation;
 
     public SQRelationAccess(D4EArtifact artifact) {
         super(artifact);