- added earliestPublicationDate for App/Models/Dataset.ts

- new classes TokenWorkerService.ts, TokenWorker.ts and ResumptionToken.ts for using REDIS with paging OAI results
- deletd public/asstes2/langCodeMap.xml: integrated it directly in datasetxml2oai-pmh.xslt
- added redis npm package
- added TokenWorkerProvider.ts for using singleton of TokenWorkerService inside OaiController.ts
- added config/oai.ts for oai related configs from .env-file
- adapted XmlModel.ts for grting domDocument from database

app/Library/XmlModel.ts

@@ -3,6 +3,7 @@ import { XMLBuilder } from 'xmlbuilder2/lib/interfaces';
 import Dataset from 'App/Models/Dataset';
 import Strategy from './Strategy';
 import { DateTime } from 'luxon';
+import { builder } from 'xmlbuilder2';
 
 /**
  * This is the description of the interface
@@ -84,10 +85,21 @@ export default class XmlModel {
                 this.cache = this.cache || new DocumentXmlCache();
                 this.cache.document_id = dataset.id;
                 this.cache.xml_version = 1; // (int)$this->strategy->getVersion();
-                // this.cache.server_date_modified = dataset.server_date_modified.toFormat("yyyy-MM-dd HH:mm:ss");
+                this.cache.server_date_modified = dataset.server_date_modified.toFormat("yyyy-MM-dd HH:mm:ss");
                 this.cache.xml_data = domDocument.end();
                 await this.cache.save();
             }
+            const node = domDocument.find(
+                (n) => {
+                    const test = n.node.nodeName == 'Rdr_Dataset';
+                    return test;
+                },
+                false,
+                true,
+            )?.node;
+            if(node != undefined) {
+                domDocument = builder({ version: '1.0', encoding: 'UTF-8', standalone: true }, node);
+            }
         }
         return domDocument;
     }