Add identifier logging

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

@@ -135,9 +135,18 @@ public class OAIPMHImpl implements OAIPMHProducer {
 
     String result = "";
 
+    System.out.println("Incoming ID (POST): " + identifier);
+
     try {
       result = getStringFromJAXBOAIElement(verb,
-          handleRequest(verb, identifier, metadataPrefix, set, from, until, resumptionToken));
+          handleRequest(
+              verb,
+              identifier,
+              metadataPrefix,
+              set,
+              from,
+              until,
+              resumptionToken));
 
     } catch (ParseException | IOException e) {
       // TODO Auto-generated catch block
@@ -158,6 +167,8 @@ public class OAIPMHImpl implements OAIPMHProducer {
 
     String result = "";
 
+    System.out.println("Incoming ID (GET): " + identifier);
+
     try {
       result = getStringFromJAXBOAIElement(verb,
           handleRequest(