diff --git a/oaipmh-core/src/main/java/info/textgrid/middleware/IdentifierListDelivererDC.java b/oaipmh-core/src/main/java/info/textgrid/middleware/IdentifierListDelivererDC.java
index 713847cbd599a5cd985c03769b9edb1aa9d68ea4..37b24222c945fc4ab26e03d261df53f262a1768c 100644
--- a/oaipmh-core/src/main/java/info/textgrid/middleware/IdentifierListDelivererDC.java
+++ b/oaipmh-core/src/main/java/info/textgrid/middleware/IdentifierListDelivererDC.java
@@ -40,8 +40,6 @@ public class IdentifierListDelivererDC extends IdentifierListDelivererAbstract {
   private static Log log = LogFactory.getLog(IdentifierListDelivererDC.class);
 
   private static final int lifeTimeResToken = 100;
-  private static final String DH_ES_DIVIDER_CHAR = ".";
-  private static final String DH_ES_DIVIDER_REGEXP = "\\.";
 
   // private static org.apache.commons.logging.Log log =
   // LogFactory.getLog(IdentifierListDelivererDC.class);
@@ -197,34 +195,10 @@ public class IdentifierListDelivererDC extends IdentifierListDelivererAbstract {
         JSONObject json = new JSONObject(hit.getSourceAsMap());
 
         // Get modifiedDate field.
-        if (this.dateOfObjectCreation.contains(DH_ES_DIVIDER_CHAR)) {
-
+        // FIXME Möglicherweise doppelt gemoppelt? Sind auch einzelne Abfragefelder in
+        // OAIPMHUtilities.fieldLoader() abgebildet?
+        if (this.dateOfObjectCreation.contains(OAIPMHUtilities.ES_DIVIDER_CHAR)) {
           this.datestamp = OAIPMHUtilities.fieldLoader(json, this.dateOfObjectCreation);
-
-          // // Divide object.
-          // String dateOfObjectCreationEntries[] =
-          // this.dateOfObjectCreation.split(DH_ES_DIVIDER_REGEXP);
-          //
-          // // System.out.println(" ## divider --> " + DH_ES_DIVIDER_CHAR);
-          // // System.out.println(" ## length of dOOCD --> " + dateOfObjectCreationEntries.length);
-          // // System.out.println(" ## dOOCD --> " + dateOfObjectCreationEntries);
-          //
-          // if (dateOfObjectCreationEntries.length != 2) {
-          // // FIXME Go to ERROR state!
-          // } else {
-          // String prefix = dateOfObjectCreationEntries[0];
-          // String suffix = dateOfObjectCreationEntries[1];
-          //
-          // if (hit.getSourceAsMap().containsKey(prefix)) {
-          //
-          // HashMap<String, Object> prefixMap =
-          // (HashMap<String, Object>) hit.getSourceAsMap().get(prefix);
-          //
-          // // System.out.println(" ## prefix value (" + prefix + ") --> " + prefixMap);
-          //
-          // this.datestamp = prefixMap.get(suffix).toString();
-          // }
-          // }
         } else {
           this.datestamp = hit.getSourceAsMap().get(this.dateOfObjectCreation).toString();
         }
@@ -247,33 +221,10 @@ public class IdentifierListDelivererDC extends IdentifierListDelivererAbstract {
 
         // Get identifier field.
         String identifier = "";
-        if (this.identifierField.contains(DH_ES_DIVIDER_CHAR)) {
-
+        // FIXME Möglicherweise doppelt gemoppelt? Sind auch einzelne Abfragefelder in
+        // OAIPMHUtilities.fieldLoader() abgebildet?
+        if (this.identifierField.contains(OAIPMHUtilities.ES_DIVIDER_CHAR)) {
           identifier = OAIPMHUtilities.fieldLoader(json, this.identifierField);
-
-          // // Divide object.
-          // String identifierEntries[] = this.identifierField.split(DH_ES_DIVIDER_REGEXP);
-          //
-          // // System.out.println(" ## divider --> " + DH_ES_DIVIDER_CHAR);
-          // // System.out.println(" ## length of iE --> " + identifierEntries.length);
-          // // System.out.println(" ## iE --> " + identifierEntries);
-          //
-          // if (identifierEntries.length != 2) {
-          // // FIXME Go to ERROR state!
-          // } else {
-          // String prefix = identifierEntries[0];
-          // String suffix = identifierEntries[1];
-          //
-          // if (hit.getSourceAsMap().containsKey(prefix)) {
-          //
-          // HashMap<String, Object> prefixMap =
-          // (HashMap<String, Object>) hit.getSourceAsMap().get(prefix);
-          //
-          // // System.out.println(" ## prefix value (" + prefix + ") --> " + prefixMap);
-          //
-          // identifier = prefixMap.get(suffix).toString();
-          // }
-          // }
         } else {
           identifier = hit.getSourceAsMap().get(this.identifierField).toString();
         }
diff --git a/oaipmh-core/src/main/java/info/textgrid/middleware/OAIPMHUtilities.java b/oaipmh-core/src/main/java/info/textgrid/middleware/OAIPMHUtilities.java
index c3accfb67bbfca9342591db916f21a0faf29b203..d542db6ef145ea82f789ac3b5b80359af81e36f4 100644
--- a/oaipmh-core/src/main/java/info/textgrid/middleware/OAIPMHUtilities.java
+++ b/oaipmh-core/src/main/java/info/textgrid/middleware/OAIPMHUtilities.java
@@ -1,12 +1,8 @@
 package info.textgrid.middleware;
 
-import java.io.FileInputStream;
-import java.io.FileNotFoundException;
 import java.io.IOException;
-import java.io.InputStream;
 import java.io.StringWriter;
 import java.math.BigInteger;
-import java.text.DateFormat;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
@@ -18,31 +14,16 @@ import java.util.Map;
 import java.util.Properties;
 import java.util.TimeZone;
 import javax.xml.bind.JAXBContext;
-import javax.xml.bind.JAXBElement;
 import javax.xml.bind.JAXBException;
 import javax.xml.bind.Marshaller;
 import javax.xml.datatype.DatatypeConfigurationException;
 import javax.xml.datatype.DatatypeFactory;
 import javax.xml.datatype.XMLGregorianCalendar;
-import javax.xml.stream.XMLInputFactory;
-import javax.xml.stream.XMLStreamConstants;
-import javax.xml.stream.XMLStreamException;
-import javax.xml.stream.XMLStreamReader;
-import org.apache.commons.io.IOUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.elasticsearch.action.get.GetRequest;
 import org.elasticsearch.action.get.GetResponse;
-import org.elasticsearch.action.search.SearchRequest;
-import org.elasticsearch.action.search.SearchResponse;
-import org.elasticsearch.action.search.SearchScrollRequest;
 import org.elasticsearch.client.RequestOptions;
-import org.elasticsearch.common.Strings;
-import org.elasticsearch.common.unit.TimeValue;
-import org.elasticsearch.index.query.QueryBuilder;
-import org.elasticsearch.index.query.QueryBuilders;
-import org.elasticsearch.search.SearchHit;
-import org.elasticsearch.search.builder.SearchSourceBuilder;
 import org.elasticsearch.search.fetch.subphase.FetchSourceContext;
 import org.json.JSONArray;
 import org.json.JSONException;
@@ -52,15 +33,12 @@ import info.textgrid.clients.tgauth.AuthClientException;
 import info.textgrid.middleware.oaipmh.GetRecordType;
 import info.textgrid.middleware.oaipmh.HeaderType;
 import info.textgrid.middleware.oaipmh.ListMetadataFormatsType;
-import info.textgrid.middleware.oaipmh.ListRecordsType;
 import info.textgrid.middleware.oaipmh.MetadataFormatType;
 import info.textgrid.middleware.oaipmh.MetadataType;
-import info.textgrid.middleware.oaipmh.OAIPMHtype;
 import info.textgrid.middleware.oaipmh.RecordType;
 import info.textgrid.middleware.oaipmh.Resource;
 import info.textgrid.middleware.oaipmh.ResumptionTokenType;
 import info.textgrid.namespaces.middleware.tgauth.ProjectInfo;
-import info.textgrid.middleware.common.TextGridMimetypes;
 
 /**
  * <p>
@@ -92,11 +70,13 @@ public class OAIPMHUtilities {
       "https://dublincore.org/schemas/xmls/simpledc20021212.xsd";
   public static final String METS_NAMESPACE = "http://www.loc.gov/METS/";
   public static final String METS_SCHEMA_LOCATION = "http://www.loc.gov/standards/mets/mets.xsd";
-
   public static final String OPEN_AIRE_SCHEMA_LOCATION =
       "https://www.openaire.eu/schema/1.0/oaf-1.0.xsd";
   public static final String OPEN_AIRE_NAMESPACE = "oai_datacite";
 
+  public static final String ES_DIVIDER_CHAR = ".";
+  public static final String ES_DIVIDER_REGEXP = "\\.";
+
   // **
   // CLASS
   // **
@@ -459,7 +439,7 @@ public class OAIPMHUtilities {
     List<String> fieldResulsts = new ArrayList<String>();
 
     for (String field : fields) {
-      String[] fieldPathForESIndex = field.split("\\.");
+      String[] fieldPathForESIndex = field.split(ES_DIVIDER_REGEXP);
       JSONObject singlePath = resultFromGetRequestInES;
       for (int i = 0; i < fieldPathForESIndex.length; i++) {
         if (i < fieldPathForESIndex.length - 1) {
@@ -502,7 +482,7 @@ public class OAIPMHUtilities {
 
     log.debug("Inside fieldLoader for field: " + field);
 
-    String[] fieldPathForESIndex = field.split("\\.");
+    String[] fieldPathForESIndex = field.split(ES_DIVIDER_REGEXP);
     JSONObject singlePath = resultFromGetRequestInES;
     for (int i = 0; i < fieldPathForESIndex.length; i++) {