Add identifier log

oaipmh-core/src/main/java/info/textgrid/middleware/RecordListDelivererDC.java

@@ -236,6 +236,9 @@ public class RecordListDelivererDC extends RecordListDelivererAbstract {
 
             // Get identifier and setSpec field, add setSpec prefix if not already set.
             String identifier = OAIPMHUtilities.fieldLoader(json, this.identifierField);
+
+            System.out.println("id=" + identifier);
+
             String setSpec = OAIPMHUtilities.getSetSpec(set, this.specFieldPrefix, identifier);
 
             try {