diff --git a/Tethys.code-workspace b/Tethys.code-workspace
index 779fe6a..9930a34 100644
--- a/Tethys.code-workspace
+++ b/Tethys.code-workspace
@@ -7,6 +7,12 @@
 	"settings": {
 		// "phpfmt.php_bin": "\"C:\\ProgramData\\scoop\\apps\\php-nts\\current\\php.exe\"",
 		"phpfmt.php_bin": "php",
-		"phpfmt.psr2": true
+		"phpfmt.psr2": true,
+		"phpcs.standard": "PSR2",
+		"phpcs.executablePath": "C:\\Users\\arno\\scoop\\apps\\composer\\current\\home\\vendor\\bin\\phpcs",
+		"phpsab.standard": "PSR2",
+		"phpsab.executablePathCBF": "C:\\Users\\arno\\scoop\\apps\\composer\\current\\home\\vendor\\bin\\phpcbf.bat",
+		"phpsab.executablePathCS":"C:\\Users\\arno\\scoop\\apps\\composer\\current\\home\\vendor\\bin\\phpcs.bat",
+		"phpsab.snifferEnable": true
 	}
 }
\ No newline at end of file
diff --git a/app/Http/Controllers/DoiController.php b/app/Http/Controllers/DoiController.php
new file mode 100644
index 0000000..7f0dcdb
--- /dev/null
+++ b/app/Http/Controllers/DoiController.php
@@ -0,0 +1,203 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Interfaces\DOIInterface;
+use App\Models\Dataset;
+use App\Models\DatasetIdentifier;
+use Illuminate\Http\Request;
+use App\Models\Oai\OaiModelError;
+use App\Exceptions\OaiModelException;
+use Illuminate\Support\Facades\Log;
+
+class DoiController extends Controller
+{
+    protected $doiService;
+    protected $LaudatioUtils;
+
+     /**
+     * Holds xml representation of document information to be processed.
+     *
+     * @var \DomDocument  Defaults to null.
+     */
+    protected $xml = null;
+     /**
+     * Holds the stylesheet for the transformation.
+     *
+     * @var \DomDocument  Defaults to null.
+     */
+    protected $xslt = null;
+
+    /**
+     * Holds the xslt processor.
+     *
+     * @var \XSLTProcessor  Defaults to null.
+     */
+    protected $proc = null;
+
+    /**
+     * DOIController constructor.
+     * @param DoiInterface $DOIService
+     */
+    public function __construct(DoiInterface $DoiClient)
+    {
+        $this->doiClient = $DoiClient;
+       
+        $this->xml = new \DomDocument();
+        $this->proc = new \XSLTProcessor();
+    }
+
+    /**
+     * Display a listing of the resource.
+     *
+     * @return \Illuminate\Http\Response
+     */
+    public function index()
+    {
+        //
+    }
+
+    /**
+     * Show the form for creating a new resource.
+     *
+     * @return \Illuminate\Http\Response
+     */
+    public function create(Request $request)
+    {
+       //
+    }
+
+    /**
+     * Store a newly created resource in storage.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return \Illuminate\Http\Response
+     */
+    public function store(Request $request)
+    {
+        $dataId = $request->input('publish_id');
+        
+        // Setup stylesheet
+        $this->loadStyleSheet(public_path() .'\prefixes\doi_datacite.xslt');
+
+       // set timestamp
+        $date = new \DateTime();
+        $unixTimestamp = $date->getTimestamp();
+        $this->proc->setParameter('', 'unixTimestamp', $unixTimestamp);
+
+        $prefix = config('tethys.datacite_prefix');
+        $this->proc->setParameter('', 'prefix', $prefix);
+
+        $repIdentifier = "tethys";
+        $this->proc->setParameter('', 'repIdentifier', $repIdentifier);
+
+        $this->xml->appendChild($this->xml->createElement('Datasets'));
+        $dataset = Dataset::where('publish_id', '=', $dataId)->firstOrFail();
+        if (is_null($dataset)) {
+            throw new OaiModelException('Dataset is not available for registering DOI!', OaiModelError::NORECORDSMATCH);
+        }
+        $dataset->fetchValues();
+        $xmlModel = new \App\Library\Xml\XmlModel();
+        $xmlModel->setModel($dataset);
+        $xmlModel->excludeEmptyFields();
+        $cache = ($dataset->xmlCache) ? $dataset->xmlCache : new \App\Models\XmlCache();
+        $xmlModel->setXmlCache($cache);
+        $domNode = $xmlModel->getDomDocument()->getElementsByTagName('Rdr_Dataset')->item(0);
+        $node = $this->xml->importNode($domNode, true);
+        $this->addSpecInformation($node, 'data-type:' . $dataset->type);
+
+        $this->xml->documentElement->appendChild($node);
+        $xmlMeta = $this->proc->transformToXML($this->xml);
+        Log::alert($xmlMeta);
+       //create doiValue and correspunfing landingpage of tehtys
+        $doiValue = $prefix . '/tethys.' . $dataset->publish_id;
+        $appUrl = config('app.url');
+        $landingPageUrl = $appUrl . "/dataset/" . $dataset->publish_id;
+        $response = $this->doiClient->registerDoi($doiValue, $xmlMeta, $landingPageUrl);
+        if ($response->getStatusCode() == 201) {
+            $doi = new DatasetIdentifier();
+            $doi['value'] = $doiValue;
+            $doi['dataset_id'] = $dataset->id;
+            $doi['type'] = "doi";
+            $doi['status'] = "registered";
+            $doi['registration_ts'] = now();
+            // $doi->save();
+        }
+    }
+
+    /**
+     * Display the specified resource.
+     *
+     * @param  \App\Models\DatasetIdentifier  $doi
+     * @return \Illuminate\Http\Response
+     */
+    public function show(DatasetIdentifier $doi)
+    {
+        //
+    }
+
+    /**
+     * Show the form for editing the specified resource.
+     *
+     * @param  \App\Models\DatasetIdentifier  $doi
+     * @return \Illuminate\Http\Response
+     */
+    public function edit(DatasetIdentifier $doi)
+    {
+        //
+    }
+
+    /**
+     * Update the specified resource in storage.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \App\Models\DatasetIdentifier  $doi
+     * @return \Illuminate\Http\Response
+     */
+    public function update(Request $request, DatasetIdentifier $doi)
+    {
+        //
+    }
+
+    /**
+     * Remove the specified resource from storage.
+     *
+     * @param  \App\Models\DatasetIdentifier  $doi
+     * @return \Illuminate\Http\Response
+     */
+    public function destroy(DatasetIdentifier $doi)
+    {
+        //
+    }
+
+   
+
+    
+    /**
+     * Load an xslt stylesheet.
+     *
+     * @return void
+     */
+    private function loadStyleSheet($stylesheet)
+    {
+        $this->xslt = new \DomDocument;
+        $this->xslt->load($stylesheet);
+        $this->proc->importStyleSheet($this->xslt);
+        if (isset($_SERVER['HTTP_HOST'])) {
+            $this->proc->setParameter('', 'host', $_SERVER['HTTP_HOST']);
+        }
+        //$this->proc->setParameter('', 'server', $this->getRequest()->getBaseUrl());
+    }
+
+    private function addSpecInformation(\DOMNode $document, $information)
+    {
+        $setSpecAttribute = $this->xml->createAttribute('Value');
+        $setSpecAttributeValue = $this->xml->createTextNode($information);
+        $setSpecAttribute->appendChild($setSpecAttributeValue);
+
+        $setSpecElement = $this->xml->createElement('SetSpec');
+        //$setSpecElement =new \DOMElement("SetSpec");
+        $setSpecElement->appendChild($setSpecAttribute);
+        $document->appendChild($setSpecElement);
+    }
+}
diff --git a/app/Interfaces/DoiInterface.php b/app/Interfaces/DoiInterface.php
new file mode 100644
index 0000000..151bb62
--- /dev/null
+++ b/app/Interfaces/DoiInterface.php
@@ -0,0 +1,16 @@
+<?php
+/**
+ * Created by Visual Studio Code.
+ * User: kaiarn
+ * Date: 19.02.2021
+ */
+namespace App\Interfaces;
+
+interface DoiInterface
+{
+    public function registerDoi($doiValue, $xmlMeta, $landingPageUrl);
+    public function getMetadataForDoi($identifier);
+    public function updateMetadataForDoi($identifier, $new_meta);
+    public function deleteMetadataForDoi($identifier);
+    // public function deleteDoiByCurlRequest($doi);
+}
diff --git a/app/Models/DatasetIdentifier.php b/app/Models/DatasetIdentifier.php
new file mode 100644
index 0000000..36f04a4
--- /dev/null
+++ b/app/Models/DatasetIdentifier.php
@@ -0,0 +1,19 @@
+<?php
+namespace App\Models;
+
+use App\Models\Dataset;
+use Illuminate\Database\Eloquent\Model;
+
+class DatasetIdentifier extends Model
+{
+    protected $table = 'dataset_identifierss';
+    protected $guarded = array();
+
+    /**
+     * The dataset that belong to the DocumentIdentifier.
+     */
+    public function dataset()
+    {
+        return $this->belongsTo(Dataset::class, 'document_id', 'id');
+    }
+}
diff --git a/app/Providers/DoiServiceProvider.php b/app/Providers/DoiServiceProvider.php
new file mode 100644
index 0000000..94de187
--- /dev/null
+++ b/app/Providers/DoiServiceProvider.php
@@ -0,0 +1,44 @@
+<?php
+/**
+ * Visual Studio Code.
+ * User: kaiarn
+ * Date: 19.02.21
+ */
+
+namespace App\Providers;
+
+use App\Tethys\Utils\DoiService;
+use Illuminate\Support\ServiceProvider;
+
+class DoiServiceProvider extends ServiceProvider
+{
+    protected $defer = true;
+
+    /**
+     * Bootstrap the application services.
+     *
+     * @return void
+     */
+    public function boot()
+    {
+        //
+    }
+
+    /**
+     * Register the application services.
+     *
+     * @return void
+     */
+    public function register()
+    {
+        //
+        $this->app->singleton('App\Interfaces\DoiInterface', function ($app) {
+            return new DoiService();
+        });
+    }
+
+    public function provides()
+    {
+        return [DoiService::class];
+    }
+}
diff --git a/app/Tethys/Utils/DoiClient.php b/app/Tethys/Utils/DoiClient.php
new file mode 100644
index 0000000..ce300ea
--- /dev/null
+++ b/app/Tethys/Utils/DoiClient.php
@@ -0,0 +1,212 @@
+<?php
+namespace App\Tethys\Utils;
+
+use GuzzleHttp\Client;
+use Illuminate\Support\Facades\Log;
+use App\Interfaces\DoiInterface;
+
+class DoiClient implements DoiInterface
+{
+    private $username;
+    private $password;
+    private $serviceUrl;
+
+    public function __construct()
+    {
+        $datacite_environment = "production"; //config('tethys.datacite_environment');
+        if ($datacite_environment == "debug") {
+            $this->username = config('tethys.datacite_test_username');
+            $this->password = config('tethys.datacite_test_password');
+            $this->serviceUrl = config('tethys.test_datacite_service_url');
+            $this->prefix = config('tethys.datacite_prefix');
+        } elseif ($datacite_environment == "production") {
+            $this->username = config('tethys.datacite_username');
+            $this->password = config('tethys.datacite_password');
+            $this->serviceUrl = config('tethys.datacite_service_url');
+            $this->prefix = config('tethys.datacite_prefix');
+        }
+        if (is_null($this->username) || is_null($this->password) || is_null($this->serviceUrl)) {
+            $message = 'missing configuration settings to properly initialize DOI client';
+            Log::error($message);
+            throw new DoiClientException($message);
+        }
+    }
+
+    /**
+     * Creates a DOI or ARK with the given identifier
+     *
+     * @param string $identifier The desired DOI identifier e.g. '10.5072/tethys.999',
+     * @param $xmlMeta
+     * @param $landingPageUrl e.g. https://www.tethys.at/dataset/1
+     *
+     * @return GuzzleHttp\Psr7\Response The http response in the form of a Guzzle response
+     */
+    public function registerDoi($doiValue, $xmlMeta, $landingPageUrl)
+    {
+       
+        // Schritt 1: Metadaten als XML registrieren
+        $response = null;
+        $url = $this->serviceUrl . '/metadata/' . $doiValue;
+        try {
+            $client = new Client([
+                'auth' => [$this->username, $this->password],
+                // 'base_uri' => $url,
+                'verify' => false,
+                'headers' => [
+                    'Content-Type' => 'application/xml;charset=UTF-8',
+                ],
+                // 'body' => $xmlMeta,
+            ]);
+            // Provide the body as a string.
+            $response = $client->request('PUT', $url, [
+                'body' => $xmlMeta,
+            ]);
+        } catch (\Exception $e) {
+            $message = 'request to ' . $url . ' failed with ' . $e->getMessage();
+            // $this->log($message, 'err');
+            throw new DoiClientException($message);
+        }
+        // Response Codes
+        // 201 Created: operation successful
+        // 400 Bad Request: invalid XML, wrong prefix
+        // 401 Unauthorised: no login
+        // 403 Forbidden: login problem, quota exceeded
+        // 415 Wrong Content Type : Not including content type in the header.
+        // 422 Unprocessable Entity : invalid XML
+        if ($response->getStatusCode() != 201) {
+            $message = 'unexpected DataCite MDS response code ' . $response->getStatusCode();
+            // $this->log($message, 'err');
+            throw new DoiClientException($message);
+        }
+
+        // Schritt 2: Register the DOI name
+        // DOI und URL der Frontdoor des zugehörigen Dokuments übergeben
+        $url = $this->serviceUrl . '/doi/' . $doiValue;
+        try {
+            $client = new Client(
+                [
+                    'auth' => [$this->username, $this->password],
+                    'verify' => false,
+                    'headers' => [
+                        'Content-Type' => 'text/plain;charset=UTF-8',
+                    ],
+                ]
+            );
+            $data = "doi=$doiValue\nurl=" . $landingPageUrl;
+            // $client->setRawData($data, 'text/plain;charset=UTF-8');
+            $response = $client->request('PUT', $url, [
+                'body' => $data,
+                'headers' => [
+                    'Content-Type' => 'text/plain;charset=UTF-8',
+                ],
+            ]);
+        } catch (\Exception $e) {
+            $message = 'request to ' . $url . ' failed with ' . $e->getMessage();
+            // $this->log($message, 'err');
+            throw new DoiClientException($message);
+        }
+        // Response Codes
+        // 201 Created: operation successful
+        // 400 Bad Request: request body must be exactly two lines: DOI and URL; wrong domain, wrong prefix;
+        // 401 Unauthorised: no login
+        // 403 Forbidden: login problem, quota exceeded
+        // 412 Precondition failed: metadata must be uploaded first.
+        
+        // $this->log('DataCite response status code (expected 201): ' . $response->getStatus());
+        // $this->log('DataCite response body: ' . $response->getBody());
+
+        if ($response->getStatusCode() != 201) {
+            $message = 'unexpected DataCite MDS response code ' . $response->getStatusCode();
+            // $this->log($message, 'err');
+            throw new DoiClientException($message);
+        }
+        return $response;
+    }
+
+    /* Response Status Codes
+     * 200 OK: operation successful
+     * 204 No Content : DOI is known to DataCite Metadata Store (MDS), but is not minted (or not resolvable e.g. due
+     *     to handle's latency)
+     * 401 Unauthorized: no login
+     * 403 Login problem or dataset belongs to another party
+     * 404 Not Found: DOI does not exist in our database (e.g. registration pending)
+     *
+     * @param $doiValue
+     * @param $landingPageURL
+     *
+     * @return bool Methode liefert true, wenn die DOI erfolgreich registiert wurde und die Prüfung positiv ausfällt.
+     *
+     * @throws ClientException
+     *
+     */
+    public function checkDoi($doiValue, $landingPageURL): bool
+    {
+        $response = null;
+        $url = $this->serviceUrl . '/doi/' . $doiValue;
+        try {
+            $client = new Client([
+                'base_uri' => $this->serviceUrl . '/doi/' . $doiValue,
+                'auth' => [$this->username, $this->password],
+                'verify' => false,
+            ]);
+            $response = $client->request('GET');
+        } catch (\Exception $e) {
+            $message = 'request to ' . $url . ' failed with ' . $e->getMessage();
+            Log::error($message);
+            // throw new \Exception($message);
+            return false;
+        }
+
+        $statusCode = $response->getStatusCode();
+        // in $body steht die URL zur Frontdoor, die mit der DOI verknüpft wurde
+        $body = $response->getBody();
+
+        // $this->log('DataCite response status code (expected 200): ' . $statusCode);
+        // $this->log('DataCite response body (expected ' . $landingPageURL . '): ' . $body);
+
+        return ($statusCode == 200 && $landingPageURL == $body);
+    }
+
+    public function getMetadataForDoi($identifier)
+    {
+        //
+    }
+
+    public function updateMetadataForDoi($identifier, $new_meta)
+    {
+        //
+    }
+
+    /**
+     * Markiert den Datensatz zur übergebenen DOI als inaktiv.
+     *
+     * @param $doiValue
+     *
+     * @throws ClientException
+     */
+    public function deleteMetadataForDoi($doiValue)
+    {
+        $response = null;
+        $url = $this->serviceUrl . '/metadata/' . $doiValue;
+        try {
+            $client = new Client([
+                'base_uri' => $url,
+                'auth' => [$this->username, $this->password],
+                'verify' => false,
+            ]);
+            $response = $client->request('DELETE');
+        } catch (\Exception $e) {
+            $message = 'request to ' . $url . ' failed with ' . $e->getMessage();
+            Log::error($message, 'err');
+            throw new DoiClientException($message);
+        }
+
+        // $this->log('DataCite response status code (expected 200): ' . $response->getStatus());
+
+        if ($response->getStatusCode() != 200) {
+            $message = 'unexpected DataCite MDS response code ' . $response->getStatusCode();
+            Log::error($message, 'err');
+            throw new DoiClientException($message);
+        }
+    }
+}
diff --git a/app/Tethys/Utils/DoiClientException.php b/app/Tethys/Utils/DoiClientException.php
new file mode 100644
index 0000000..551b118
--- /dev/null
+++ b/app/Tethys/Utils/DoiClientException.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace App\Tethys\Utils;
+
+class DoiClientException extends \Exception
+{
+}
diff --git a/composer.json b/composer.json
index 1f7be84..f794b84 100755
--- a/composer.json
+++ b/composer.json
@@ -10,13 +10,14 @@
 	"require": {
 		"php": "^7.2",
 		"arifhp86/laravel-clear-expired-cache-file": "^0.0.4",
-		"astrotomic/laravel-translatable": "^11.1",	
+		"astrotomic/laravel-translatable": "^11.1",
 		"diglactic/laravel-breadcrumbs": "^6.1",
 		"doctrine/dbal": "v2.4.2",
 		"felixkiss/uniquewith-validator": "^3.1",
 		"fideloper/proxy": "^4.0",
-		"halpdesk/zizaco-entrust-laravel-6.0": "^1.9",
-		"laravel/framework": "^6.2",
+		"guzzlehttp/guzzle": "^7.2",
+		"halpdesk/zizaco-entrust-laravel-6.0": "^1.9",	
+		"laravel/framework": "^6.20",
 		"laravel/tinker": "^2.0",
 		"laravelcollective/html": "^6.1",
 		"mcamara/laravel-localization": "^1.3",
@@ -24,8 +25,8 @@
 		"yajra/laravel-datatables-oracle": "^9.0"
 	},
 	"require-dev": {
-		"fzaninotto/faker": "^1.8",
-		"phpunit/phpunit": "^7.0"
+		"fzaninotto/faker": "^1.9.1",
+		"phpunit/phpunit": "^8.5.8|^9.3.3"
 	},
 	"autoload": {
 		"files": [
@@ -56,7 +57,8 @@
 		"post-autoload-dump": [
 			"Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
 			"@php artisan package:discover --ansi"
-		]
+		],
+		"test": "php vendor/phpunit/phpunit/phpunit --testsuite Feature"
 	},
 	"config": {
 		"preferred-install": "dist",
diff --git a/composer.lock b/composer.lock
index cfdeec5..6fd3f88 100755
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "5d81f639dee75fada34e0a28b51d091a",
+    "content-hash": "35ca81482e9d3fef8e82fc9006da7f93",
     "packages": [
         {
             "name": "arifhp86/laravel-clear-expired-cache-file",
@@ -255,16 +255,16 @@
         },
         {
             "name": "doctrine/annotations",
-            "version": "1.11.1",
+            "version": "1.12.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/annotations.git",
-                "reference": "ce77a7ba1770462cd705a91a151b6c3746f9c6ad"
+                "reference": "b17c5014ef81d212ac539f07a1001832df1b6d3b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/annotations/zipball/ce77a7ba1770462cd705a91a151b6c3746f9c6ad",
-                "reference": "ce77a7ba1770462cd705a91a151b6c3746f9c6ad",
+                "url": "https://api.github.com/repos/doctrine/annotations/zipball/b17c5014ef81d212ac539f07a1001832df1b6d3b",
+                "reference": "b17c5014ef81d212ac539f07a1001832df1b6d3b",
                 "shasum": ""
             },
             "require": {
@@ -279,11 +279,6 @@
                 "phpunit/phpunit": "^7.5 || ^9.1.5"
             },
             "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.11.x-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
                     "Doctrine\\Common\\Annotations\\": "lib/Doctrine/Common/Annotations"
@@ -324,9 +319,9 @@
             ],
             "support": {
                 "issues": "https://github.com/doctrine/annotations/issues",
-                "source": "https://github.com/doctrine/annotations/tree/1.11.1"
+                "source": "https://github.com/doctrine/annotations/tree/1.12.1"
             },
-            "time": "2020-10-26T10:28:16+00:00"
+            "time": "2021-02-21T21:00:45+00:00"
         },
         {
             "name": "doctrine/cache",
@@ -1422,6 +1417,238 @@
             },
             "time": "2020-10-22T13:48:01+00:00"
         },
+        {
+            "name": "guzzlehttp/guzzle",
+            "version": "7.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/guzzle.git",
+                "reference": "0aa74dfb41ae110835923ef10a9d803a22d50e79"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/0aa74dfb41ae110835923ef10a9d803a22d50e79",
+                "reference": "0aa74dfb41ae110835923ef10a9d803a22d50e79",
+                "shasum": ""
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@@ -2609,6 +2836,111 @@
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@@ -5567,9 +5944,9 @@
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+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "c6c1022351a901512170118436c764e473f6de8c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/c6c1022351a901512170118436c764e473f6de8c",
+                "reference": "c6c1022351a901512170118436c764e473f6de8c",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
                 }
             },
             "autoload": {
@@ -6835,9 +7548,15 @@
             "homepage": "https://github.com/sebastianbergmann/version",
             "support": {
                 "issues": "https://github.com/sebastianbergmann/version/issues",
-                "source": "https://github.com/sebastianbergmann/version/tree/master"
+                "source": "https://github.com/sebastianbergmann/version/tree/3.0.2"
             },
-            "time": "2016-10-03T07:35:21+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-09-28T06:39:44+00:00"
         },
         {
             "name": "theseer/tokenizer",
diff --git a/config/app.php b/config/app.php
index a1648a7..f09095f 100755
--- a/config/app.php
+++ b/config/app.php
@@ -2,7 +2,7 @@
 
 return [
 
-        /*
+    /*
     |--------------------------------------------------------------------------
     | Application Name
     |--------------------------------------------------------------------------
@@ -11,13 +11,13 @@ return [
     | framework needs to place the application's name in a notification or
     | any other location as required by the application or its packages.
     |
-    */
+     */
 
     'workspacePath' => storage_path() . DIRECTORY_SEPARATOR . "workspace",
 
     'name' => env('APP_NAME', 'Tethys'),
-    
-     /*
+
+    /*
     |--------------------------------------------------------------------------
     | Application Environment
     |--------------------------------------------------------------------------
@@ -26,10 +26,10 @@ return [
     | running in. This may determine how you prefer to configure various
     | services your application utilizes. Set this in your ".env" file.
     |
-    */
+     */
 
     'env' => env('APP_ENV', 'production'),
-    
+
     /*
     |--------------------------------------------------------------------------
     | Application Debug Mode
@@ -39,7 +39,7 @@ return [
     | stack traces will be shown on every error that occurs within your
     | application. If disabled, a simple generic error page is shown.
     |
-    */
+     */
 
     'debug' => env('APP_DEBUG', false),
 
@@ -52,7 +52,7 @@ return [
     | the Artisan command line tool. You should set this to the root of
     | your application so that it is used when running Artisan tasks.
     |
-    */
+     */
 
     'url' => env('APP_URL', 'http://localhost'),
 
@@ -65,7 +65,7 @@ return [
     | will be used by the PHP date and date-time functions. We have gone
     | ahead and set this to a sensible default for you out of the box.
     |
-    */
+     */
     // https://www.php.net/manual/en/timezones.europe.php
     'timezone' => 'Europe/Vienna',
 
@@ -78,7 +78,7 @@ return [
     | by the translation service provider. You are free to set this value
     | to any of the locales which will be supported by the application.
     |
-    */
+     */
 
     'locale' => env('APP_LOCALE', 'en'),
 
@@ -91,7 +91,7 @@ return [
     | is not available. You may change the value to correspond to any of
     | the language folders that are provided through your application.
     |
-    */
+     */
 
     'fallback_locale' => env('APP_FALLBACK_LOCALE', 'en'),
 
@@ -104,7 +104,7 @@ return [
     | to a random, 32 character string, otherwise these encrypted strings
     | will not be safe. Please do this before deploying an application!
     |
-    */
+     */
 
     'key' => env('APP_KEY', 'SomeRandomString'),
 
@@ -121,7 +121,7 @@ return [
     |
     | Available Settings: "single", "daily", "syslog", "errorlog"
     |
-    */
+     */
 
     // 'log' => 'single',
     // //debug, info, notice, warning, error, critical, alert, emergency.
@@ -136,7 +136,7 @@ return [
     | request to your application. Feel free to add your own services to
     | this array to grant expanded functionality to your applications.
     |
-    */
+     */
 
     'providers' => [
 
@@ -167,7 +167,7 @@ return [
         'Illuminate\Validation\ValidationServiceProvider',
         'Illuminate\View\ViewServiceProvider',
 
-         /*
+        /*
          * Package Service Providers...
          */
         // 'Illuminate\Html\HtmlServiceProvider',
@@ -178,15 +178,15 @@ return [
         /*
          * Application Service Providers...
          */
-        'App\Providers\AppServiceProvider',
+        App\Providers\AppServiceProvider::class,
         App\Providers\AuthServiceProvider::class,
-       // App\Providers\BroadcastServiceProvider::class,
-        'App\Providers\ConfigServiceProvider',
-        'App\Providers\EventServiceProvider',
-        'App\Providers\RouteServiceProvider',
-         // List off others providers...
-         App\Providers\SolariumServiceProvider::class,
-        
+        // App\Providers\BroadcastServiceProvider::class,
+        App\Providers\ConfigServiceProvider::class,
+        App\Providers\EventServiceProvider::class,
+        App\Providers\RouteServiceProvider::class,
+        // List off others providers...
+        App\Providers\SolariumServiceProvider::class,
+        App\Providers\DoiServiceProvider::class,
 
     ],
 
@@ -199,55 +199,56 @@ return [
     | is started. However, feel free to register as many as you wish as
     | the aliases are "lazy" loaded so they don't hinder performance.
     |
-    */
+     */
 
     'aliases' => [
 
-        'App'       => 'Illuminate\Support\Facades\App',
+        'App' => Illuminate\Support\Facades\App::class,
         'Arr' => Illuminate\Support\Arr::class,
-        'Artisan'   => 'Illuminate\Support\Facades\Artisan',
+        'Artisan' => Illuminate\Support\Facades\Artisan::class,
         'Auth' => Illuminate\Support\Facades\Auth::class,
         'Blade' => Illuminate\Support\Facades\Blade::class,
         'Broadcast' => Illuminate\Support\Facades\Broadcast::class,
-        'Bus'       => 'Illuminate\Support\Facades\Bus',
-        'Cache'     => 'Illuminate\Support\Facades\Cache',
-        'Config'    => 'Illuminate\Support\Facades\Config',
-        'Cookie'    => 'Illuminate\Support\Facades\Cookie',
-        'Crypt'     => 'Illuminate\Support\Facades\Crypt',
-        'DB'        => 'Illuminate\Support\Facades\DB',
-        'Eloquent'  => 'Illuminate\Database\Eloquent\Model',
-        'Event'     => 'Illuminate\Support\Facades\Event',
-        'File'      => 'Illuminate\Support\Facades\File',
+        'Bus' => 'Illuminate\Support\Facades\Bus',
+        'Cache' => 'Illuminate\Support\Facades\Cache',
+        'Config' => 'Illuminate\Support\Facades\Config',
+        'Cookie' => 'Illuminate\Support\Facades\Cookie',
+        'Crypt' => 'Illuminate\Support\Facades\Crypt',
+        'DB' => 'Illuminate\Support\Facades\DB',
+        'Eloquent' => 'Illuminate\Database\Eloquent\Model',
+        'Event' => 'Illuminate\Support\Facades\Event',
+        'File' => 'Illuminate\Support\Facades\File',
         'Gate' => Illuminate\Support\Facades\Gate::class,
-        'Hash'      => 'Illuminate\Support\Facades\Hash',
-        'Input'     => 'Illuminate\Support\Facades\Input',
+        'Hash' => Illuminate\Support\Facades\Hash::class,
+        'Input' => Illuminate\Support\Facades\Input::class,
         // 'Inspiring' => 'Illuminate\Foundation\Inspiring',
-        'Lang'      => 'Illuminate\Support\Facades\Lang',
+        'Lang' => Illuminate\Support\Facades\Lang::class,
         'Log' => Illuminate\Support\Facades\Log::class,
-        'Mail'      => 'Illuminate\Support\Facades\Mail',
+        'Mail' => 'Illuminate\Support\Facades\Mail',
         'Notification' => Illuminate\Support\Facades\Notification::class,
-        'Password'  => 'Illuminate\Support\Facades\Password',
-        'Queue'     => 'Illuminate\Support\Facades\Queue',
-        'Redirect'  => 'Illuminate\Support\Facades\Redirect',
-        'Redis'     => 'Illuminate\Support\Facades\Redis',
-        'Request'   => 'Illuminate\Support\Facades\Request',
-        'Response'  => 'Illuminate\Support\Facades\Response',
-        'Route'     => 'Illuminate\Support\Facades\Route',
-        'Schema'    => 'Illuminate\Support\Facades\Schema',
-        'Session'   => 'Illuminate\Support\Facades\Session',
-        'Storage'   => 'Illuminate\Support\Facades\Storage',
-        'URL'       => 'Illuminate\Support\Facades\URL',
+        'Password' => 'Illuminate\Support\Facades\Password',
+        'Queue' => 'Illuminate\Support\Facades\Queue',
+        'Redirect' => 'Illuminate\Support\Facades\Redirect',
+        'Redis' => 'Illuminate\Support\Facades\Redis',
+        'Request' => 'Illuminate\Support\Facades\Request',
+        'Response' => 'Illuminate\Support\Facades\Response',
+        'Route' => 'Illuminate\Support\Facades\Route',
+        'Schema' => 'Illuminate\Support\Facades\Schema',
+        'Session' => 'Illuminate\Support\Facades\Session',
+        'Storage' => 'Illuminate\Support\Facades\Storage',
+        'URL' => 'Illuminate\Support\Facades\URL',
         'Validator' => 'Illuminate\Support\Facades\Validator',
-        'View'      => 'Illuminate\Support\Facades\View',
+        'View' => 'Illuminate\Support\Facades\View',
 
-         /*
+        /*
          * Third Party Aliases
          */
         // 'Form' => 'Illuminate\Html\FormFacade',
         // 'HTML' => 'Illuminate\Html\HtmlFacade',
         // 'Form' => 'Collective\Html\FormFacade',
         // 'Html' => 'Collective\Html\HtmlFacade',
-        'Breadcrumbs' => DaveJamesMiller\Breadcrumbs\Facades\Breadcrumbs::class,
+        // 'Breadcrumbs' => DaveJamesMiller\Breadcrumbs\Facades\Breadcrumbs::class,
+        'Breadcrumbs' => Diglactic\Breadcrumbs\Breadcrumbs::class,
         //'Datatables' => Yajra\DataTables\Facades\DataTables::class
 
     ],
diff --git a/config/database.php b/config/database.php
index 8e577f1..5f8887e 100755
--- a/config/database.php
+++ b/config/database.php
@@ -45,6 +45,18 @@ return [
     */
 
     'connections' => [
+        'testing' => [
+            'driver'   => 'pgsql',
+            'host'     => env('DB_HOST', 'pgsql'),
+            'port' => env('DB_PORT', '5432'),
+            'database' => env('DB_DATABASE'),
+            'username' => env('DB_USERNAME'),
+            'password' => env('DB_PASSWORD'),
+            'charset' => 'utf8',
+            'prefix'   => '',
+            'schema' => env('DB_SCHEMA', 'public'),
+            'sslmode' => 'prefer',
+        ],
 
         'sqlite' => [
             'driver'   => 'sqlite',
@@ -56,9 +68,9 @@ return [
             'driver'   => 'pgsql',
             'host'     => env('DB_HOST', 'pgsql'),
             'port' => env('DB_PORT', '5432'),
-            'database' => env('DB_DATABASE', 'repository'),
-            'username' => env('DB_USERNAME', 'opus4admin'),
-            'password' => env('DB_PASSWORD', 'opus4admin007'),
+            'database' => env('DB_DATABASE'),
+            'username' => env('DB_USERNAME'),
+            'password' => env('DB_PASSWORD'),
             'charset' => 'utf8',
             'prefix'   => '',
             'schema' => env('DB_SCHEMA', 'public'),
@@ -68,10 +80,10 @@ return [
         
         'sqlsrv' => [
             'driver'   => 'sqlsrv',
-            'host'     => env('DB_HOST', 'zontik\test'),
-            'database' => env('DB_DATABASE', 'opusdb'),
-            'username' => env('DB_USERNAME', 'opus4'),
-            'password' => env('DB_PASSWORD', 'opus4007'),
+            'host'     => env('DB_HOST'),
+            'database' => env('DB_DATABASE'),
+            'username' => env('DB_USERNAME'),
+            'password' => env('DB_PASSWORD'),
             'prefix'   => '',
         ],
 
diff --git a/config/tethys.php b/config/tethys.php
new file mode 100644
index 0000000..32ee19a
--- /dev/null
+++ b/config/tethys.php
@@ -0,0 +1,13 @@
+<?php
+return [
+    'repoid' => 3156505,
+    'ccBaseuri' => 'https://creativecommons.org/licenses/|/3.0/',
+    'datacite_username' => env('DATACITE_USERNAME'),
+    // 'datacite_test_username' => env('DATACITE_TEST_USERNAME'),
+    'datacite_password' => env('DATACITE_PASSWORD'),
+    // 'datacite_test_password' => env('DATACITE_TEST_PASSWORD'),
+    'datacite_service_url' => env('DATACITE_SERVICE_URL'),
+    // 'datacite_test_service_url' => env('DATACITE_TEST_SERVICE_URL'),
+    'datacite_prefix' => env('DATACITE_PREFIX'),
+    'base_domain' => 'https://www.tethys.at/',
+];
diff --git a/database/migrations/2021_02_26_153027_create_dataset_identifiers_table.php b/database/migrations/2021_02_26_153027_create_dataset_identifiers_table.php
new file mode 100644
index 0000000..d7e2de4
--- /dev/null
+++ b/database/migrations/2021_02_26_153027_create_dataset_identifiers_table.php
@@ -0,0 +1,54 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateDatasetIdentifiersTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('dataset_identifiers', function (Blueprint $table) {
+            // primary key
+            $table->increments('id');
+
+            // foreign key to: documents.id
+            $table->integer('dataset_id')->unsigned();
+            ;
+            $table->foreign('dataset_id')->references('id')->on('documents')
+            ->onUpdate('cascade')->onDelete('cascade');
+
+            // value of the identifier
+            $table->string('value', 255);
+            $table->enum(
+                'type',
+                ["doi", "handle", "isbn", "issn",  "url", "urn"]
+            );
+            // DOI registration status
+            $table->enum(
+                'status',
+                ['draft', 'registered', 'findable']
+            )->nullable();
+            // timestamp of DOI registration
+            $table->timestamp('registration_ts');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('dataset_identifiers', function (Blueprint $table) {
+            //
+        });
+    }
+}
diff --git a/doi_notes.txt b/doi_notes.txt
new file mode 100644
index 0000000..5f7000c
--- /dev/null
+++ b/doi_notes.txt
@@ -0,0 +1,10 @@
+doi_notes:
+
+php artisan make:controller DOIController --resource --model "Models\DatasetIdentifier"
+
+
+
+composer require guzzlehttp/guzzle
+
+
+php artisan make:migration create_dataset_identifiers_table --table="dataset_identifiers"
\ No newline at end of file
diff --git a/phpunit.xml b/phpunit.xml
index d66acd0..78e182a 100755
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,23 +1,34 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit backupGlobals="false"
-         backupStaticAttributes="false"
-         bootstrap="bootstrap/autoload.php"
-         colors="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         processIsolation="false"
-         stopOnFailure="false"
-         syntaxCheck="false">
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+xsi:noNamespaceSchemaLocation="./vendor/phpunit/phpunit/phpunit.xsd" 
+bootstrap="vendor/autoload.php" 
+colors="true"
+cacheResult ="false">
     <testsuites>
         <testsuite name="Application Test Suite">
             <directory>./tests/</directory>
         </testsuite>
+        <!-- <testsuite name="Unit">
+            <directory suffix="Test.php">./tests/Unit</directory>
+        </testsuite> -->
+
+        <testsuite name="Feature">
+            <directory>./tests/Feature</directory>
+        </testsuite>
     </testsuites>
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">./app</directory>
+        </whitelist>
+    </filter>
     <php>
         <env name="APP_ENV" value="testing"/>
-        <env name="CACHE_DRIVER" value="array"/>
-        <env name="SESSION_DRIVER" value="array"/>
-        <env name="QUEUE_DRIVER" value="sync"/>
+        <server name="BCRYPT_ROUNDS" value="4"/>
+        <server name="CACHE_DRIVER" value="array"/>
+        <server name="DB_CONNECTION" value="testing"/>
+        <!-- <server name="DB_DATABASE" value=":memory:"/> -->
+        <server name="MAIL_DRIVER" value="array"/>
+        <server name="QUEUE_CONNECTION" value="sync"/>
+        <server name="SESSION_DRIVER" value="array"/>
     </php>
 </phpunit>
diff --git a/public/prefixes/doi_datacite.xslt b/public/prefixes/doi_datacite.xslt
new file mode 100644
index 0000000..7b7c0e7
--- /dev/null
+++ b/public/prefixes/doi_datacite.xslt
@@ -0,0 +1,368 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/**
+ * This file is part of TETHYS. 
+ *
+ * LICENCE
+ * TETHYS is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the Licence, or any later version.
+ * OPUS is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details. You should have received a copy of the GNU General Public License
+ * along with OPUS; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * @category    Application
+ * @package     Module_Oai
+ * @author      Arno Kaimbacher <arno.kaimbacher@geologie.ac.at>
+ * @copyright   Copyright (c) 2018-2019, GBA TETHYS development team
+ * @license     http://www.gnu.org/licenses/gpl.html General Public License
+ */
+-->
+
+<!--
+/**
+ * Transforms the xml representation of an TETHYS model dataset to datacite
+ * xml as required by the OAI-PMH protocol.
+ */
+-->
+<xsl:stylesheet version="1.0"
+    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+    xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/"
+    xmlns:dc="http://purl.org/dc/elements/1.1/"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns:php="http://php.net/xsl" exclude-result-prefixes="php">
+
+    <xsl:output method="xml" indent="yes" />
+
+    <xsl:param name="unixTimestamp" />
+    <xsl:param name="prefix" />
+    <xsl:param name="repIdentifier" />
+
+    <!--create the head of oai response  -->
+    <xsl:template match="Rdr_Dataset">
+        <resource xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+            xmlns="http://datacite.org/schema/kernel-4" xsi:schemaLocation="http://datacite.org/schema/kernel-4 http://schema.datacite.org/meta/kernel-4.3/metadata.xsd">
+            <!-- <isReferenceQuality>true</isReferenceQuality>
+      <schemaVersion>4.3</schemaVersion>
+      <datacentreSymbol>RDR.GBA</datacentreSymbol> -->
+            <identifier identifierType="DOI">
+                <xsl:value-of select="$prefix" />
+                <xsl:text>/</xsl:text>
+                <xsl:value-of select="$repIdentifier" />
+                <xsl:text>.</xsl:text>
+                <xsl:value-of select="@PublishId" />
+            </identifier>
+            <!--<datacite:creator>-->
+            <creators>
+                <xsl:apply-templates select="PersonAuthor" mode="oai_datacite" />
+            </creators>
+            <titles>
+                <xsl:apply-templates select="TitleMain" mode="oai_datacite" />
+                <xsl:apply-templates select="TitleAdditional" mode="oai_datacite" />
+            </titles>
+            <publisher>
+                <!-- <xsl:value-of select="@PublisherName" /> -->
+                <xsl:value-of select="@CreatingCorporation" />
+            </publisher>
+            <publicationYear>
+                <xsl:value-of select="ServerDatePublished/@Year"/>
+            </publicationYear>
+            <subjects>
+                <xsl:apply-templates select="Subject" mode="oai_datacite" />
+            </subjects>
+            <language>
+                <xsl:value-of select="@Language" />
+            </language>
+            <xsl:if test="PersonContributor">
+                <contributors>
+                    <xsl:apply-templates select="PersonContributor" mode="oai_datacite" />
+                </contributors>
+            </xsl:if>
+            <dates>
+                <xsl:call-template name="RdrDate2" mode="oai_datacite" />
+            </dates>
+            <resourceType resourceTypeGeneral="Dataset">
+                <xsl:text>Dataset</xsl:text>
+                <!-- <xsl:value-of select="@Type" /> -->
+            </resourceType>
+
+            <alternateIdentifiers>
+                <xsl:call-template name="AlternateIdentifier"/>
+            </alternateIdentifiers>
+
+            <xsl:if test="Reference">
+                <relatedIdentifiers>
+                    <xsl:apply-templates select="Reference" mode="oai_datacite" />
+                </relatedIdentifiers>
+            </xsl:if>
+            <rightsList>
+                <xsl:apply-templates select="Licence" mode="oai_datacite" />
+            </rightsList>
+            <sizes>
+                <size>
+                    <xsl:value-of select="count(File)"/>
+                    <xsl:text> datasets</xsl:text>
+                </size>
+            </sizes>
+            <formats>
+                <xsl:apply-templates select="File/@MimeType" mode="oai_datacite" />
+            </formats>
+            <descriptions>
+                <xsl:apply-templates select="TitleAbstract" mode="oai_datacite" />
+                <xsl:apply-templates select="TitleAbstractAdditional" mode="oai_datacite" />
+            </descriptions>
+            <geoLocations>
+                <xsl:apply-templates select="Coverage" mode="oai_datacite" />
+                <!-- <geoLocation>
+                    <geoLocationBox>
+                        <westBoundLongitude>6.58987</westBoundLongitude>
+                        <eastBoundLongitude>6.83639</eastBoundLongitude>
+                        <southBoundLatitude>50.16</southBoundLatitude>
+                        <northBoundLatitude>50.18691</northBoundLatitude>
+                    </geoLocationBox>
+                </geoLocation> -->
+            </geoLocations>
+        </resource>
+    </xsl:template>
+
+    <xsl:template name="RdrDate2" mode="oai_datacite"
+        xmlns="http://datacite.org/schema/kernel-4">
+        <xsl:if test="EmbargoDate and ($unixTimestamp &lt; EmbargoDate/@UnixTimestamp)">
+            <date>
+                <xsl:attribute name="dateType">Available</xsl:attribute>
+                <xsl:variable name="embargoDate" select="concat(
+                    EmbargoDate/@Year, '-',
+                    format-number(EmbargoDate/@Month,'00'), '-',
+                    format-number(EmbargoDate/@Day,'00')     
+                )" />
+                <xsl:value-of select="$embargoDate" />
+            </date>
+        </xsl:if>
+        <xsl:if test="CreatedAt">
+            <date>
+                <xsl:attribute name="dateType">Created</xsl:attribute>
+                <xsl:variable name="createdAt" select="concat(
+                    CreatedAt/@Year, '-',
+                    format-number(CreatedAt/@Month,'00'), '-',
+                    format-number(CreatedAt/@Day,'00')        
+                )" />
+                <xsl:value-of select="$createdAt" />
+            </date>
+        </xsl:if>
+    </xsl:template>
+
+    <xsl:template match="Coverage" mode="oai_datacite"
+        xmlns="http://datacite.org/schema/kernel-4">
+        <geoLocation>
+            <geoLocationBox>
+                <westBoundLongitude>
+                    <xsl:value-of select="@XMin" />
+                </westBoundLongitude>
+                <eastBoundLongitude>
+                    <xsl:value-of select="@XMax" />
+                </eastBoundLongitude>
+                <southBoundLatitude>
+                    <xsl:value-of select="@YMin" />
+                </southBoundLatitude>
+                <northBoundLatitude>
+                    <xsl:value-of select="@YMax" />
+                </northBoundLatitude>
+            </geoLocationBox>
+        </geoLocation>
+    </xsl:template>
+
+    <xsl:template match="TitleAbstract" mode="oai_datacite"
+        xmlns="http://datacite.org/schema/kernel-4">
+        <description>
+            <xsl:attribute name="xml:lang">
+                <xsl:value-of select="@Language" />
+            </xsl:attribute>
+            <xsl:if test="@Type != ''">
+                <xsl:attribute name="descriptionType">
+                    <xsl:value-of select="@Type" />
+                </xsl:attribute>
+            </xsl:if>
+            <xsl:value-of select="@Value" />
+        </description>
+    </xsl:template>
+    <xsl:template match="TitleAbstractAdditional" mode="oai_datacite"
+        xmlns="http://datacite.org/schema/kernel-4">
+        <description>
+            <xsl:attribute name="xml:lang">
+                <xsl:value-of select="@Language" />
+            </xsl:attribute>
+            <xsl:if test="@Type != ''">
+                <xsl:attribute name="descriptionType">
+                    <xsl:value-of select="@Type" />
+                </xsl:attribute>
+            </xsl:if>
+            <xsl:value-of select="@Value" />
+        </description>
+    </xsl:template>
+
+    <xsl:template match="TitleMain" mode="oai_datacite"
+        xmlns="http://datacite.org/schema/kernel-4">
+        <title>
+            <xsl:if test="@Language != ''">
+                <xsl:attribute name="xml:lang">
+                    <xsl:value-of select="@Language" />
+                </xsl:attribute>
+            </xsl:if>
+            <xsl:if test="@Type != '' and @Type != 'Main'">
+                <xsl:attribute name="titleType">
+                    <xsl:value-of select="@Type" />
+                </xsl:attribute>
+            </xsl:if>
+            <xsl:value-of select="@Value"/>
+        </title>
+    </xsl:template>
+    <xsl:template match="TitleAdditional" mode="oai_datacite"
+        xmlns="http://datacite.org/schema/kernel-4">
+        <title>
+            <xsl:if test="@Language != ''">
+                <xsl:attribute name="xml:lang">
+                    <xsl:value-of select="@Language" />
+                </xsl:attribute>
+            </xsl:if>
+            <xsl:if test="@Type != '' and @Type != 'Main'">
+                <xsl:attribute name="titleType">
+                    <xsl:value-of select="@Type" />
+                </xsl:attribute>
+            </xsl:if>
+            <xsl:value-of select="@Value"/>
+        </title>
+    </xsl:template>
+
+    <xsl:template match="Subject" mode="oai_datacite"
+        xmlns="http://datacite.org/schema/kernel-4">
+        <subject>
+            <xsl:if test="@Language != ''">
+                <xsl:attribute name="xml:lang">
+                    <xsl:value-of select="@Language" />
+                </xsl:attribute>
+            </xsl:if>
+            <xsl:value-of select="@Value" />
+        </subject>
+    </xsl:template>
+
+    <xsl:template name="AlternateIdentifier" mode="oai_datacite"
+        xmlns="http://datacite.org/schema/kernel-4">
+        <alternateIdentifier >
+            <xsl:attribute name="alternateIdentifierType">
+                <xsl:text>url</xsl:text>
+            </xsl:attribute>
+            <!-- <xsl:variable name="identifier" select="concat($repURL, '/dataset/', @Id)" /> -->
+            <xsl:value-of select="@landingpage"/>
+        </alternateIdentifier >
+    </xsl:template>
+
+    <xsl:template match="Reference" mode="oai_datacite"
+        xmlns="http://datacite.org/schema/kernel-4">
+        <relatedIdentifier>
+            <xsl:attribute name="relatedIdentifierType">
+                <xsl:value-of select="@Type" />
+            </xsl:attribute>
+            <xsl:attribute name="relationType">
+                <xsl:value-of select="@Relation" />
+            </xsl:attribute>
+            <xsl:value-of select="@Value" />
+        </relatedIdentifier>
+    </xsl:template>
+
+    <xsl:template match="PersonContributor" mode="oai_datacite"
+        xmlns="http://datacite.org/schema/kernel-4">
+        <contributor>
+            <xsl:if test="@ContributorType != ''">
+                <xsl:attribute name="contributorType">
+                    <xsl:value-of select="@ContributorType" />
+                </xsl:attribute>
+            </xsl:if>
+            <contributorName>
+                <!-- <xsl:if test="@NameType != ''">
+                    <xsl:attribute name="nameType">
+                        <xsl:value-of select="@NameType" />
+                    </xsl:attribute>
+                </xsl:if> -->
+                <xsl:value-of select="concat(@FirstName, ' ',@LastName)" />
+            </contributorName>
+        </contributor>
+    </xsl:template>
+
+    <xsl:template match="PersonAuthor" mode="oai_datacite"
+        xmlns="http://datacite.org/schema/kernel-4">
+        <creator>
+            <creatorName>
+                <xsl:if test="@NameType != ''">
+                    <xsl:attribute name="nameType">
+                        <xsl:value-of select="@NameType" />
+                    </xsl:attribute>
+                </xsl:if>
+                <xsl:value-of select="@LastName" />
+                <xsl:if test="@FirstName != ''">
+                    <xsl:text>, </xsl:text>
+                </xsl:if>
+                <xsl:value-of select="@FirstName" />
+                <xsl:if test="@AcademicTitle != ''">
+                    <xsl:text> (</xsl:text>
+                    <xsl:value-of select="@AcademicTitle" />
+                    <xsl:text>)</xsl:text>
+                </xsl:if>
+            </creatorName>
+            <givenName>
+                <xsl:value-of select="@FirstName" />
+            </givenName>
+            <familyName>
+                <xsl:value-of select="@LastName" />
+            </familyName>
+            <xsl:if test="@IdentifierOrcid != ''">
+                <nameIdentifier schemeURI="http://orcid.org/" nameIdentifierScheme="ORCID">
+                    <xsl:value-of select="@IdentifierOrcid" />
+                </nameIdentifier>
+            </xsl:if>
+            <!-- 
+        <nameType><xsl:value-of select="@NameType" /></nameType>
+      </xsl:if> -->
+            <affiliation>GBA</affiliation>
+        </creator>
+    </xsl:template>
+
+    <xsl:template match="File/@MimeType" mode="oai_datacite"
+        xmlns="http://datacite.org/schema/kernel-4">
+        <format>
+            <xsl:value-of select="." />
+        </format>
+    </xsl:template>
+
+    <xsl:template match="Licence" mode="oai_datacite"
+        xmlns="http://datacite.org/schema/kernel-4">
+        <rights>
+            <xsl:if test="@LinkLicence != ''">
+                <xsl:attribute name="rightsURI">
+                    <xsl:value-of select="@LinkLicence" />
+                </xsl:attribute>
+            </xsl:if>
+            <xsl:attribute name="schemeURI">
+                <xsl:text>https://spdx.org/licenses/</xsl:text>
+            </xsl:attribute>
+            <xsl:attribute name="rightsIdentifierScheme">
+                <xsl:text>SPDX</xsl:text>
+            </xsl:attribute>
+            <xsl:attribute name="rightsIdentifier">
+                <xsl:text>CC-BY-NC-ND-4.0</xsl:text>
+            </xsl:attribute>
+            <xsl:value-of select="@NameLong" />
+        </rights>
+        <xsl:if test="@Name = 'CC BY' or @Name = 'CC BY-SA'">
+            <rights>
+                <xsl:attribute name="rightsURI">
+                    <xsl:text>info:eu-repo/semantics/openAccess</xsl:text>
+                </xsl:attribute>
+                <xsl:text>Open Access</xsl:text>
+            </rights>
+        </xsl:if>
+    </xsl:template>
+
+</xsl:stylesheet>
\ No newline at end of file
diff --git a/routes/breadcrumbs.php b/routes/breadcrumbs.php
index 5c0cf27..92360de 100644
--- a/routes/breadcrumbs.php
+++ b/routes/breadcrumbs.php
@@ -1,5 +1,6 @@
 <?php
-use DaveJamesMiller\Breadcrumbs\Facades\Breadcrumbs;
+// use DaveJamesMiller\Breadcrumbs\Facades\Breadcrumbs;
+use Diglactic\Breadcrumbs\Breadcrumbs;
 
 // Dashboard
 Breadcrumbs::register('settings.dashboard', function ($trail) {
diff --git a/tests/ExampleTest.php b/tests/ExampleTest.php
index 3dc3061..f081ac1 100755
--- a/tests/ExampleTest.php
+++ b/tests/ExampleTest.php
@@ -1,4 +1,5 @@
 <?php
+namespace Tests;
 
 class ExampleTest extends TestCase
 {
@@ -11,7 +12,6 @@ class ExampleTest extends TestCase
     public function testBasicExample()
     {
         $response = $this->call('GET', '/');
-
         $this->assertEquals(200, $response->getStatusCode());
     }
 }
diff --git a/tests/Feature/DoiClientTest.php b/tests/Feature/DoiClientTest.php
new file mode 100644
index 0000000..6d78beb
--- /dev/null
+++ b/tests/Feature/DoiClientTest.php
@@ -0,0 +1,68 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Foundation\Testing\WithFaker;
+use Tests\TestCase;
+use App\Tethys\Utils\DoiClient;
+use Illuminate\Http\Request;
+
+class DoiClientTest extends TestCase
+{
+    /**
+     * A basic feature test example.
+     *
+     * @return void
+     */
+    // public function testExample()
+    // {
+    //     $response = $this->get('/');
+    //     $response->assertStatus(200);
+    // }
+
+    // public function testCheckDoi()
+    // {
+    //     $client = new DoiClient();
+    //     // $this->setExpectedException('Opus\Doi\ClientException');
+    //     $result = $client->checkDoi(
+    //         '10.5072/tethys-999',
+    //         'http://localhost/opus4/frontdoor/index/index/999'
+    //     );
+    //     $this->assertTrue($result);
+
+    //     $result = $client->checkDoi(
+    //         '10.5072/tethys-999',
+    //         'http://localhost/opus4/frontdoor/index/index/111'
+    //     );
+    //     $this->assertFalse($result);
+    // }
+
+    public function testRegisterDoiWithDataCiteTestAccount()
+    {
+        // $this->markTestSkipped(
+        //     'Test kann nur manuell gestartet werden (Zugangsdaten zum MDS-Testservice von DataCite erforderlich)'
+        // );
+
+        $myRequest = new Request();
+        $myRequest->setMethod('POST');
+
+        $myRequest->request->add(
+            [
+                'publish_id' => 1,
+                'path' => 'https://www.demo.laudatio-repository.org/foo'
+            ]
+        );
+
+        $doiController = new \App\Http\Controllers\DoiController(new DoiClient());
+        $doiController->store($myRequest);
+        
+
+        // $client = new DoiClient();
+        // $client->registerDoi(
+        //     '10.5072/tethys-999',
+        //     xmlMeta,
+        //     'http://localhost/opus4/frontdoor/index/index/999'
+        // );
+    }
+}
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 069f0b8..db891b9 100755
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -1,6 +1,10 @@
 <?php
+namespace Tests;
 
-class TestCase extends Illuminate\Foundation\Testing\TestCase
+use Illuminate\Contracts\Console\Kernel;
+use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
+
+abstract class TestCase extends BaseTestCase
 {
     /**
      * Creates the application.
@@ -9,10 +13,8 @@ class TestCase extends Illuminate\Foundation\Testing\TestCase
      */
     public function createApplication()
     {
-        $app = require __DIR__.'/../bootstrap/app.php';
-
-        $app->make('Illuminate\Contracts\Console\Kernel')->bootstrap();
-
+        $app = require __DIR__ . '/../bootstrap/app.php';
+        $app->make(Kernel::class)->bootstrap();
         return $app;
     }
 }