diff --git a/app/Events/Dataset/DatasetUpdated.php b/app/Events/Dataset/DatasetUpdated.php
new file mode 100644
index 0000000..b724f6e
--- /dev/null
+++ b/app/Events/Dataset/DatasetUpdated.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Events\Dataset;
+
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Broadcasting\InteractsWithSockets;
+
+/**
+ * Class DatasetUpdated.
+ */
+class DatasetUpdated
+{
+    use Dispatchable, InteractsWithSockets, SerializesModels;
+
+    /**
+     * @var
+     */
+    public $dataset;
+
+    /**
+     * Create a new event instance.
+     *
+     * @return void
+     */
+    public function __construct($dataset)
+    {
+        $this->dataset = $dataset;
+    }
+}
diff --git a/app/Events/Event.php b/app/Events/Event.php
index d59f769..6e88b5b 100755
--- a/app/Events/Event.php
+++ b/app/Events/Event.php
@@ -1,7 +1,7 @@
-<?php namespace App\Events;
-
-abstract class Event {
-
-	//
+<?php
+namespace App\Events;
 
+abstract class Event
+{
+    //
 }
diff --git a/app/Http/Controllers/Frontend/PagesController.php b/app/Http/Controllers/Frontend/PagesController.php
index 8d5b662..2259a16 100644
--- a/app/Http/Controllers/Frontend/PagesController.php
+++ b/app/Http/Controllers/Frontend/PagesController.php
@@ -32,11 +32,13 @@ class PagesController extends Controller
         $dataset->load('titles');
         $dataset->load('abstracts');
 
-        $authors = $dataset->authors()
+        $authors = $dataset->persons()
+        ->wherePivot('role', 'author')
         ->orderBy('link_documents_persons.sort_order', 'desc')
         ->get();
 
-        $contributors = $dataset->contributors()
+        $contributors = $dataset->persons()
+        ->wherePivot('role', 'contributor')
         ->orderBy('link_documents_persons.sort_order', 'desc')
         ->get();
 
diff --git a/app/Http/Controllers/Oai/RequestController.php b/app/Http/Controllers/Oai/RequestController.php
index fc8ed6e..bc9744e 100644
--- a/app/Http/Controllers/Oai/RequestController.php
+++ b/app/Http/Controllers/Oai/RequestController.php
@@ -449,7 +449,8 @@ class RequestController extends Controller
         $xmlModel = new \App\Library\Xml\XmlModel();
         $xmlModel->setModel($dataset);
         $xmlModel->excludeEmptyFields();
-        $xmlModel->setXmlCache(new \App\Models\XmlCache());
+        $cache = ($dataset->xmlCache) ?  $dataset->xmlCache : new \App\Models\XmlCache();
+        $xmlModel->setXmlCache($cache);
         return $xmlModel->getDomDocument()->getElementsByTagName('Rdr_Dataset')->item(0);
     }
 
diff --git a/app/Http/Controllers/Settings/DatasetController.php b/app/Http/Controllers/Settings/DatasetController.php
index 2aa8bff..fbc7638 100644
--- a/app/Http/Controllers/Settings/DatasetController.php
+++ b/app/Http/Controllers/Settings/DatasetController.php
@@ -12,6 +12,7 @@ use Illuminate\View\View;
 use Illuminate\Http\RedirectResponse;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Http\Request;
+use App\Exceptions\GeneralException;
 
 class DatasetController extends Controller
 {
@@ -22,7 +23,6 @@ class DatasetController extends Controller
 
     public function index(Request $request) : View
     {
-                
         $searchType = $request->input('searchtype');
         $builder = Dataset::query();
         //$registers = array();
@@ -155,8 +155,11 @@ class DatasetController extends Controller
     {
         $dataset = Dataset::findOrFail($id);
         //$input = $request->all();
-        $input = $request->except('licenses', 'titles');
-        $dataset->update($input);
+        $input = $request->except('abstracts', 'licenses', 'titles', '_method', '_token');
+        // foreach ($input as $key => $value) {
+        //     $dataset[$key] = $value;
+        // }
+        //$dataset->update($input);
         // $dataset->type = $input['type'];
         // $dataset->thesis_year_accepted = $input['thesis_year_accepted'];
         // $dataset->project_id = $input['project_id'];
@@ -188,8 +191,17 @@ class DatasetController extends Controller
             }
         }
 
-        session()->flash('flash_message', 'You have updated 1 dataset!');
-        return redirect()->route('settings.document');
+        if (! $dataset->isDirty(dataset::UPDATED_AT)) {
+            $time = new \Illuminate\Support\Carbon();
+            $dataset->setUpdatedAt($time);
+        }
+        // $dataset->save();
+        if ($dataset->update($input)) {
+            //event(new DatasetUpdated($dataset));
+            session()->flash('flash_message', 'You have updated 1 dataset!');
+            return redirect()->route('settings.document');
+        }
+        throw new GeneralException(trans('exceptions.backend.dataset.update_error'));
     }
 
    
diff --git a/app/Library/Search/SolariumAdapter.php b/app/Library/Search/SolariumAdapter.php
index 5af5516..9691e4d 100644
--- a/app/Library/Search/SolariumAdapter.php
+++ b/app/Library/Search/SolariumAdapter.php
@@ -3,9 +3,12 @@
 namespace App\Library\Search;
 
 //use App\Library\Util\SolrSearchQuery;
-use App\Library\Util\SearchParameter;
 use App\Library\Search\SearchResult;
+use App\Library\Util\SearchParameter;
 use Illuminate\Support\Facades\Log;
+use App\Library\Search\SolariumDocument;
+use App\Models\Dataset;
+use \Solarium\QueryType\Select\Query\Query;
 
 class SolariumAdapter
 {
@@ -50,7 +53,55 @@ class SolariumAdapter
         return 'solr';
     }
 
-    public function createQuery() : SearchParameter
+    public function addDatasetsToIndex($datasets)
+    {
+        $datasets = $this->normalizeDocuments($datasets);
+        $builder = new SolariumDocument($this->options);
+
+        $slices = array_chunk($datasets, 16);
+        // update documents of every chunk in a separate request
+        foreach ($slices as $slice) {
+            $update = $this->client->createUpdate();
+
+            $updateDocs = array_map(function ($rdrDoc) use ($builder, $update) {
+                return $builder->toSolrUpdateDocument($rdrDoc, $update->createDocument());
+            }, $slice);
+
+            // adding the document to the update query
+            $update->addDocuments($updateDocs);
+             // Then commit the update:
+             $update->addCommit();
+             $result = $this->client->update($update);
+
+            //$this->execute($update, 'failed updating slice of documents');
+        }
+
+        // finally commit all updates
+        // $update = $this->client->createUpdate();
+       
+        // $update->addCommit();
+
+        // $this->execute($update, 'failed committing update of documents');
+
+        return $this;
+    }
+
+    protected function normalizeDocuments($documents)
+    {
+        if (!is_array($documents)) {
+            $documents = array($documents);
+        }
+
+        foreach ($documents as $document) {
+            if (!($document instanceof Dataset)) {
+                throw new InvalidArgumentException("invalid dataset in provided set");
+            }
+        }
+
+        return $documents;
+    }
+
+    public function createQuery(): SearchParameter
     {
         return new SearchParameter();
     }
@@ -63,13 +114,14 @@ class SolariumAdapter
         return $searchResult;
     }
 
-    protected function applyParametersToSolariumQuery(\Solarium\QueryType\Select\Query\Query $query, SearchParameter $parameters = null, $preferOriginalQuery = false)
+    protected function applyParametersToSolariumQuery(Query $query, SearchParameter $parameters, $preferOriginalQuery)
     {
         if ($parameters) {
             //$subfilters = $parameters->getSubFilters();
             //if ( $subfilters !== null ) {
             //    foreach ( $subfilters as $name => $subfilter ) {
-            // if ( $subfilter instanceof Opus_Search_Solr_Filter_Raw || $subfilter instanceof Opus_Search_Solr_Solarium_Filter_Complex ) {
+            // if ( $subfilter instanceof Opus_Search_Solr_Filter_Raw
+            //|| $subfilter instanceof Opus_Search_Solr_Solarium_Filter_Complex ) {
             //            $query->createFilterQuery( $name )
             //                  ->setQuery( $subfilter->compile( $query ) );
             //        }
@@ -87,14 +139,13 @@ class SolariumAdapter
             // }
             // }
 
-            $filter = $parameters->getFilter();//"aa"  all: '*:*'
+            $filter = $parameters->getFilter(); //"aa"  all: '*:*'
             if ($filter !== null) {
                 //$query->setStart( intval( $start ) );
                 //$query->setQuery('%P1%', array($filter));
                 $query->setQuery($filter);
             }
 
-
             $start = $parameters->getStart();
             if ($start !== null) {
                 $query->setStart(intval($start));
@@ -154,7 +205,7 @@ class SolariumAdapter
         // }
     }
 
-    protected function processQuery(\Solarium\QueryType\Select\Query\Query $query) : SearchResult
+    protected function processQuery(\Solarium\QueryType\Select\Query\Query $query): SearchResult
     {
         // send search query to service
         $request = $this->execute($query, 'failed querying search engine');
diff --git a/app/Library/Search/SolariumDocument.php b/app/Library/Search/SolariumDocument.php
new file mode 100644
index 0000000..6203401
--- /dev/null
+++ b/app/Library/Search/SolariumDocument.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Library\Search;
+
+use App\Models\Dataset;
+use Solarium\QueryType\Update\Query\Document\Document;
+
+class SolariumDocument extends SolrDocumentXslt
+{
+    public function __construct($options)
+    {
+        parent::__construct($options);
+    }
+    
+    public function toSolrUpdateDocument(Dataset $rdrDataset, Document $solrDoc)
+    {
+        if (!($solrDoc instanceof Document)) {
+            throw new \Exception('provided Solr document must be instance of Solarium Update Document');
+        }
+        
+        // convert Opus document to Solr XML document for supporting custom transformations
+        $solrDomDoc = parent::toSolrDocument($rdrDataset, new \DomDocument());
+        
+        // read back fields from generated Solr XML document
+        $solrXmlDoc = simplexml_import_dom($solrDomDoc)->doc[0];
+
+        $solrDoc->clear();
+        foreach ($solrXmlDoc->field as $field) {
+            $solrDoc->addField(strval($field['name']), strval($field));
+        }
+
+        return $solrDoc;
+    }
+}
diff --git a/app/Library/Search/SolrDocumentXslt.php b/app/Library/Search/SolrDocumentXslt.php
new file mode 100644
index 0000000..3237cbf
--- /dev/null
+++ b/app/Library/Search/SolrDocumentXslt.php
@@ -0,0 +1,79 @@
+<?php
+
+namespace App\Library\Search;
+
+use App\Models\Dataset;
+
+class SolrDocumentXslt
+{
+    /**
+     * @var XSLTProcessor
+     */
+    protected $processor;
+
+    public function __construct($options)
+    {
+        //parent::__construct($options);
+
+        try {
+            $xslt = new \DomDocument;
+            $xslt->load($options['xsltfile']);
+
+            $this->processor = new \XSLTProcessor;
+            $this->processor->importStyleSheet($xslt);
+        } catch (Exception $e) {
+            throw new Exception('invalid XSLT file for deriving Solr documents', 0, $e);
+        }
+    }
+
+    public function toSolrDocument(Dataset $rdrDataset, \DOMDocument $solrDoc)
+    {
+        if (!($solrDoc instanceof \DOMDocument)) {
+            throw new Exception('provided Solr document must be instance of DOMDocument');
+        }
+
+        $modelXml = $this->getModelXml($rdrDataset);//->saveXML();
+
+        $solrDoc->preserveWhiteSpace = false;
+        $solrDoc->loadXML($this->processor->transformToXML($modelXml));
+
+        // if (Opus_Config::get()->log->prepare->xml) {
+        //     $modelXml->formatOutput = true;
+        //     Opus_Log::get()->debug("input xml\n" . $modelXml->saveXML());
+        //     $solrDoc->formatOutput = true;
+        //     Opus_Log::get()->debug("transformed solr xml\n" . $solrDoc->saveXML());
+        // }
+
+        return $solrDoc;
+    }
+
+    /**
+     * Retrieves XML describing model data of provided RDR dataset.
+     *
+     * @param Dataset $rdrDataset
+     * @return DOMDocument
+     */
+    protected function getModelXml(Dataset $rdrDataset)
+    {
+        $rdrDataset->fetchValues();
+        // Set up caching xml-model and get XML representation of document.
+        $xmlModel = new \App\Library\Xml\XmlModel();
+        //$caching_xml_model = new Opus_Model_Xml;
+       
+        //$caching_xml_model->setModel($opusDoc);
+        $xmlModel->setModel($rdrDataset);
+        $xmlModel->excludeEmptyFields();
+        //$xmlModel->setStrategy(new Opus_Model_Xml_Version1);
+        //$cache = new Opus_Model_Xml_Cache($opusDoc->hasPlugin('Opus_Document_Plugin_Index'));
+        //$xmlModel->setXmlCache($cache);
+        $cache = ($rdrDataset->xmlCache) ?  $rdrDataset->xmlCache : new \App\Models\XmlCache();
+        $xmlModel->setXmlCache($cache);
+
+        $modelXml = $xmlModel->getDomDocument();
+        
+        // extract fulltext from file and append it to the generated xml.
+        //$this->attachFulltextToXml($modelXml, $opusDoc->getFile(), $opusDoc->getId());
+
+        return $modelXml;
+    }
+}
diff --git a/app/Library/Xml/XmlModel.php b/app/Library/Xml/XmlModel.php
index 7d9b375..9d99f7c 100644
--- a/app/Library/Xml/XmlModel.php
+++ b/app/Library/Xml/XmlModel.php
@@ -133,12 +133,21 @@ class XmlModel
             return $domDocument;
         } else {
             //create cache relation
-            $this->cache->fill(array(
-                'document_id' => $dataset->id,
-                'xml_version' => (int)$this->strategy->getVersion(),
-                'server_date_modified' => $dataset->server_date_modified,
-                'xml_data' => $domDocument->saveXML()
-            ));
+            // $this->cache->updateOrCreate(array(
+            //     'document_id' => $dataset->id,
+            //     'xml_version' => (int)$this->strategy->getVersion(),
+            //     'server_date_modified' => $dataset->server_date_modified,
+            //     'xml_data' => $domDocument->saveXML()
+            // ));
+           
+            if (!$this->cache->document_id) {
+                $this->cache->document_id =  $dataset->id;
+            }
+            
+            $this->cache->xml_version =  (int)$this->strategy->getVersion();
+            $this->cache->server_date_modified =   $dataset->server_date_modified;
+            $this->cache->xml_data =  $domDocument->saveXML();
+
             $this->cache->save();
 
             Log::debug(__METHOD__ . ' cache refreshed for ' . get_class($dataset) . '#' . $dataset->id);
@@ -161,20 +170,35 @@ class XmlModel
             Log::debug(__METHOD__ . ' skipping cache for ' . get_class($dataset));
             return null;
         }
-        //$cached = $this->cache->hasValidEntry(
-        //    $dataset->id,
-        //    (int) $this->strategy->getVersion(),
-        //    $dataset->server_date_modified
-        //);
-
-        //$cached = false;
-        $cache = XmlCache::where('document_id', $dataset->id)
-            ->first();// model or null
-        if (!$cache) {
+        $actuallyCached = $this->cache->hasValidEntry(
+            $dataset->id,
+            $dataset->server_date_modified
+        );
+        //no actual cache
+        if (true !== $actuallyCached) {
             Log::debug(__METHOD__ . ' cache miss for ' . get_class($dataset) . '#' . $dataset->id);
             return null;
-        } else {
-            return $cache->getDomDocument();
         }
+        //cache is actual return it for oai:
+        Log::debug(__METHOD__ . ' cache hit for ' . get_class($dataset) . '#' . $dataset->id);
+        try {
+            //return $this->_cache->get($model->getId(), (int) $this->_strategy->getVersion());
+            $cache = XmlCache::where('document_id', $dataset->id)->first();
+            return $cache->getDomDocument();
+        } catch (Exception $e) {
+            Log::warning(__METHOD__ . " Access to XML cache failed on " . get_class($dataset) . '#' . $dataset->id . ".  Trying to recover.");
+        }
+
+        return null;
+
+       
+        // // $cache = XmlCache::where('document_id', $dataset->id)
+        // // ->first();// model or null
+        // if (!$cache) {
+        //     Log::debug(__METHOD__ . ' cache miss for ' . get_class($dataset) . '#' . $dataset->id);
+        //     return null;
+        // } else {
+        //     return $cache->getDomDocument();
+        // }
     }
 }
diff --git a/app/Listeners/DatasetUpdated.php b/app/Listeners/DatasetUpdated.php
new file mode 100644
index 0000000..4b7f58e
--- /dev/null
+++ b/app/Listeners/DatasetUpdated.php
@@ -0,0 +1,68 @@
+<?php
+
+namespace App\Listeners;
+
+// use Illuminate\Queue\InteractsWithQueue;
+// use Illuminate\Contracts\Queue\ShouldQueue;
+use App\Events\Dataset\DatasetUpdated as DatasetUpdatedEvent;
+use App\Models\Dataset;
+use Illuminate\Support\Facades\Log;
+use App\Library\Search\SolariumAdapter;
+
+class DatasetUpdated
+{
+    /**
+     * Create the event listener.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    /**
+     * Handle the event.
+     *
+     * @param  DatasetUpdatedEvent  $event
+     * @return void
+     */
+    public function handle(DatasetUpdatedEvent $event)
+    {
+        $dataset = $event->dataset;
+        // only index Opus_Document instances
+        if (false === ($dataset instanceof Dataset)) {
+            return;
+        }
+        if ($dataset->server_state !== 'published') {
+            // if ($dataset->getServerState() !== 'temporary') {
+            //     $this->removeDocumentFromIndexById($model->getId());
+            // }
+            return;
+        }
+
+        $this->addDatasetToIndex($dataset);
+    }
+
+    /**
+     * Helper method to add dataset to index.
+     *
+     * @param Opus_Document $document
+     * @return void
+     */
+    private function addDatasetToIndex(Dataset $dataset)
+    {
+        $datasetId = $dataset->id;
+        Log::debug(__METHOD__ . ': ' . 'Adding index job for dataset ' . $datasetId . '.');
+
+        try {
+            // Opus_Search_Service::selectIndexingService('onDocumentChange')
+            $service = new SolariumAdapter("solr", config('solarium'));
+            $service->addDatasetsToIndex($dataset);
+        } catch (Opus_Search_Exception $e) {
+            Log::debug(__METHOD__ . ': ' . 'Indexing document ' . $documentId . ' failed: ' . $e->getMessage());
+        } catch (InvalidArgumentException $e) {
+            Log::warning(__METHOD__ . ': ' . $e->getMessage());
+        }
+    }
+}
diff --git a/app/Models/Dataset.php b/app/Models/Dataset.php
index f1d0844..67e0128 100644
--- a/app/Models/Dataset.php
+++ b/app/Models/Dataset.php
@@ -26,16 +26,17 @@ class Dataset extends Model
     const UPDATED_AT = 'server_date_modified';
     const PUBLISHED_AT = 'server_date_published';
 
-    protected $fillable = [
-        'type',
-        'language',
-        'server_state',
-        'creating_corporation',
-        'project_id',
-        'embargo_date',
-        'belongs_to_bibliography',
-    ];
-    /**
+    // protected $fillable = [
+    //     'type',
+    //     'language',
+    //     'server_state',
+    //     'creating_corporation',
+    //     'project_id',
+    //     'embargo_date',
+    //     'belongs_to_bibliography',
+    // ];
+    protected $guarded = [];
+        /**
      * The attributes that should be mutated to dates.
      *
      * @var array
@@ -54,6 +55,11 @@ class Dataset extends Model
         // $this->_init();
     }
 
+    // public function setUpdatedAt($value)
+    // {
+    //     $this->{static::UPDATED_AT} = $value;
+    // }
+
     /**
      * Get the geolocation that owns the dataset.
      */
@@ -62,6 +68,8 @@ class Dataset extends Model
         return $this->hasOne(GeolocationBox::class, 'dataset_id', 'id');
     }
 
+  
+
     /**
      * Get the project that the dataset belongs to.
      */
diff --git a/app/Models/XmlCache.php b/app/Models/XmlCache.php
index f35bcd0..833edc0 100644
--- a/app/Models/XmlCache.php
+++ b/app/Models/XmlCache.php
@@ -4,6 +4,7 @@ namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
 use App\Models\Dataset;
+use Illuminate\Support\Facades\DB;
 
 class XmlCache extends Model
 {
@@ -13,7 +14,7 @@ class XmlCache extends Model
      * @var string
      */
     protected $table = 'document_xml_cache';
-    public $timestamps = false;
+    public $timestamps = false;   
 
 
     /**
@@ -22,7 +23,8 @@ class XmlCache extends Model
      * @var integer
      * @access protected
      */
-    protected $primaryKey = null;
+    //protected $primaryKey = null;
+    public $primaryKey = 'document_id';
     public $incrementing = false;
 
     /**
@@ -61,22 +63,18 @@ class XmlCache extends Model
      * @param mixed $serverDateModified
      * @return bool Returns true on cached hit else false.
      */
-    //public function scopeHasValidEntry($query, $datasetId, $xmlVersion, $serverDateModified)
-    //{
-    //    //$select = $this->_table->select()->from($this->_table);
-    //    $query->where('document_id = ?', $datasetId)
-    //        ->where('xml_version = ?', $xmlVersion)
-    //        ->where('server_date_modified = ?', $serverDateModified);
+    public function hasValidEntry($datasetId, $serverDateModified)
+    {
+        $select = DB::table('document_xml_cache');
+        $select->where('document_id', '=', $datasetId)
+        ->where('server_date_modified', '=', $serverDateModified);
+        
+        $row = $select->first();
 
-    //    $row = $query->get();
-
-    //    if (null === $row)
-    //    {
-    //       return false;
-    //    }
-    //    else
-    //    {
-    //        return true;
-    //    }
-    //}
+        if (null === $row) {
+            return false;
+        } else {
+            return true;
+        }
+    }
 }
diff --git a/app/Observers/DatasetObserver.php b/app/Observers/DatasetObserver.php
index d0b646a..c929517 100644
--- a/app/Observers/DatasetObserver.php
+++ b/app/Observers/DatasetObserver.php
@@ -5,6 +5,7 @@ namespace App\Observers;
 //php artisan make:observer DatasetObserver --model=Models\Dataset
 use App\Models\Dataset;
 use Illuminate\Support\Facades\Log;
+use App\Library\Search\SolariumAdapter;
 
 class DatasetObserver
 {
@@ -33,12 +34,12 @@ class DatasetObserver
         if (false === ($dataset instanceof Dataset)) {
             return;
         }
-        // if ($dataset->getServerState() !== 'published') {
-        //     if ($model->getServerState() !== 'temporary') {
-        //         $this->removeDocumentFromIndexById($model->getId());
-        //     }
-        //     return;
-        // }
+        if ($dataset->server_state !== 'published') {
+            // if ($dataset->getServerState() !== 'temporary') {
+            //     $this->removeDocumentFromIndexById($model->getId());
+            // }
+            return;
+        }
 
         $this->addDatasetToIndex($dataset);
     }
@@ -85,6 +86,16 @@ class DatasetObserver
     private function addDatasetToIndex(Dataset $dataset)
     {
         $datasetId = $dataset->id;
-        Log::debug(__METHOD__ . ': ' . 'Adding index job for document ' . $datasetId . '.');
+        Log::debug(__METHOD__ . ': ' . 'Adding index job for dataset ' . $datasetId . '.');
+
+        try {
+            // Opus_Search_Service::selectIndexingService('onDocumentChange')
+            $service = new SolariumAdapter("solr", config('solarium'));
+            $service->addDatasetsToIndex($dataset);
+        } catch (Opus_Search_Exception $e) {
+            Log::debug(__METHOD__ . ': ' . 'Indexing document ' . $documentId . ' failed: ' . $e->getMessage());
+        } catch (InvalidArgumentException $e) {
+            Log::warning(__METHOD__ . ': ' . $e->getMessage());
+        }
     }
 }
diff --git a/app/Providers/EventServiceProvider.php b/app/Providers/EventServiceProvider.php
index 7b1ddbd..ca973a3 100755
--- a/app/Providers/EventServiceProvider.php
+++ b/app/Providers/EventServiceProvider.php
@@ -14,6 +14,9 @@ class EventServiceProvider extends ServiceProvider
         'App\Events\Event' => [
             'App\Listeners\EventListener',
         ],
+        \App\Events\Dataset\DatasetUpdated::class => [
+            \App\Listeners\DatasetUpdated::class,
+        ],
     ];
 
     /**
diff --git a/composer.lock b/composer.lock
index 47ddb11..6948635 100755
--- a/composer.lock
+++ b/composer.lock
@@ -427,26 +427,26 @@
         },
         {
             "name": "felixkiss/uniquewith-validator",
-            "version": "3.1.2",
+            "version": "3.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/felixkiss/uniquewith-validator.git",
-                "reference": "a27d5823bcf52dac6760638c8d987760212dbf5c"
+                "reference": "11e3c12758f8f1c335618ab8eabecd338985aff9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/felixkiss/uniquewith-validator/zipball/a27d5823bcf52dac6760638c8d987760212dbf5c",
-                "reference": "a27d5823bcf52dac6760638c8d987760212dbf5c",
+                "url": "https://api.github.com/repos/felixkiss/uniquewith-validator/zipball/11e3c12758f8f1c335618ab8eabecd338985aff9",
+                "reference": "11e3c12758f8f1c335618ab8eabecd338985aff9",
                 "shasum": ""
             },
             "require": {
                 "illuminate/support": "5.*",
                 "illuminate/validation": "5.*",
-                "php": ">=5.4.0"
+                "php": ">=5.6.0"
             },
             "require-dev": {
-                "bossa/phpspec2-expect": "dev-phpspec-3.2",
-                "phpspec/phpspec": "^3.2"
+                "bossa/phpspec2-expect": "^2.3",
+                "phpspec/phpspec": "^3.4"
             },
             "type": "library",
             "extra": {
@@ -476,7 +476,7 @@
             "keywords": [
                 "laravel"
             ],
-            "time": "2017-08-06T23:28:53+00:00"
+            "time": "2019-02-12T18:30:56+00:00"
         },
         {
             "name": "fideloper/proxy",
@@ -2792,16 +2792,16 @@
         },
         {
             "name": "yajra/laravel-datatables-oracle",
-            "version": "v8.13.4",
+            "version": "v8.13.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/yajra/laravel-datatables.git",
-                "reference": "8aedd88a02599d5d0a4a1a2bb5aac849397dd594"
+                "reference": "a97a173a52f2b60075f310dac39932faa377fb4f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/yajra/laravel-datatables/zipball/8aedd88a02599d5d0a4a1a2bb5aac849397dd594",
-                "reference": "8aedd88a02599d5d0a4a1a2bb5aac849397dd594",
+                "url": "https://api.github.com/repos/yajra/laravel-datatables/zipball/a97a173a52f2b60075f310dac39932faa377fb4f",
+                "reference": "a97a173a52f2b60075f310dac39932faa377fb4f",
                 "shasum": ""
             },
             "require": {
@@ -2859,7 +2859,7 @@
                 "jquery",
                 "laravel"
             ],
-            "time": "2019-01-29T03:12:37+00:00"
+            "time": "2019-02-13T01:34:34+00:00"
         },
         {
             "name": "zizaco/entrust",
diff --git a/config/solarium.php b/config/solarium.php
index 87086ed..7804099 100644
--- a/config/solarium.php
+++ b/config/solarium.php
@@ -8,5 +8,6 @@ return [
             'path' => env('SOLR_PATH', '/solr/'),
             'core' => env('SOLR_CORE', 'opus4')
         ]
-    ]
+        ],
+        'xsltfile' => "solr.xslt"
 ];
diff --git a/public/solr.xslt b/public/solr.xslt
new file mode 100644
index 0000000..c4b1862
--- /dev/null
+++ b/public/solr.xslt
@@ -0,0 +1,361 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/**
+ * This file is part of OPUS. The software OPUS has been originally developed
+ * at the University of Stuttgart with funding from the German Research Net,
+ * the Federal Department of Higher Education and Research and the Ministry
+ * of Science, Research and the Arts of the State of Baden-Wuerttemberg.
+ *
+ * OPUS 4 is a complete rewrite of the original OPUS software and was developed
+ * by the Stuttgart University Library, the Library Service Center
+ * Baden-Wuerttemberg, the North Rhine-Westphalian Library Service Center,
+ * the Cooperative Library Network Berlin-Brandenburg, the Saarland University
+ * and State Library, the Saxon State Library - Dresden State and University
+ * Library, the Bielefeld University Library and the University Library of
+ * Hamburg University of Technology with funding from the German Research
+ * Foundation and the European Regional Development Fund.
+ *
+ * LICENCE
+ * OPUS 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    Framework
+ * @package     Opus_SolrSearch
+ * @author      Oliver Marahrens <o.marahrens@tu-harburg.de>
+ * @author      Sascha Szott <szott@zib.de>
+ * @copyright   Copyright (c) 2008-2011, OPUS 4 development team
+ * @license     http://www.gnu.org/licenses/gpl.html General Public License
+ * @version     $Id$
+ */
+-->
+
+<xsl:stylesheet version="1.0"
+    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+
+    <xsl:output method="xml" indent="yes" />
+
+    <!-- Suppress output for all elements that don't have an explicit template. -->
+    <xsl:template match="*" />
+
+    <xsl:template match="/">
+        <xsl:element name="add">
+            <xsl:element name="doc">
+
+                <!-- id -->
+                <xsl:element name="field">
+                    <xsl:attribute name="name">id</xsl:attribute>
+                    <xsl:value-of select="/Opus/Rdr_Dataset/@Id" />
+                </xsl:element>
+
+                <!-- year -->
+                <xsl:variable name="year">
+                    <xsl:choose>
+                        <xsl:when test="/Opus/Rdr_Dataset/PublishedDate/@Year != ''">
+                            <xsl:value-of select="/Opus/Rdr_Dataset/PublishedDate/@Year" />
+                        </xsl:when>
+                        <xsl:otherwise>
+                            <xsl:value-of select="/Opus/Rdr_Dataset/@PublishedYear" />
+                        </xsl:otherwise>
+                    </xsl:choose>
+                </xsl:variable>
+                
+                <xsl:element name="field">
+                    <xsl:attribute name="name">year</xsl:attribute>
+                    <xsl:value-of select="$year"/>
+                </xsl:element>
+
+                <!-- year inverted -->
+                <xsl:if test="$year">
+                    <xsl:variable name="yearInverted" select="65535 - $year"/>
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">year_inverted</xsl:attribute>
+                        <xsl:value-of select="$yearInverted"/>:<xsl:value-of select="$year"/>
+                    </xsl:element>
+                </xsl:if>
+
+                <!-- server_date_published -->
+                <xsl:if test="/Opus/Rdr_Dataset/ServerDatePublished/@UnixTimestamp != ''">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">server_date_published</xsl:attribute>
+                        <xsl:value-of select="/Opus/Rdr_Dataset/ServerDatePublished/@UnixTimestamp" />
+                    </xsl:element>
+                </xsl:if>
+
+                <!-- server_date_modified -->
+                <xsl:if test="/Opus/Rdr_Dataset/ServerDateModified/@UnixTimestamp != ''">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">server_date_modified</xsl:attribute>
+                        <xsl:value-of select="/Opus/Rdr_Dataset/ServerDateModified/@UnixTimestamp" />
+                    </xsl:element>
+                </xsl:if>
+
+                <!-- language -->
+                <xsl:variable name="language" select="/Opus/Rdr_Dataset/@Language" />
+                <xsl:element name="field">
+                    <xsl:attribute name="name">language</xsl:attribute>
+                    <xsl:value-of select="$language" />
+                </xsl:element>            
+
+                <!-- title / title_output -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/TitleMain">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">title</xsl:attribute>
+                        <xsl:value-of select="@Value" />
+                    </xsl:element>
+                    <xsl:if test="@Language = $language">
+                        <xsl:element name="field">
+                            <xsl:attribute name="name">title_output</xsl:attribute>
+                            <xsl:value-of select="@Value" />
+                        </xsl:element>
+                    </xsl:if>
+                </xsl:for-each>
+
+                <!-- abstract / abstract_output -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/TitleAbstract">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">abstract</xsl:attribute>
+                        <xsl:value-of select="@Value" />
+                    </xsl:element>
+                    <xsl:if test="@Language = $language">
+                        <xsl:element name="field">
+                            <xsl:attribute name="name">abstract_output</xsl:attribute>
+                            <xsl:value-of select="@Value" />
+                        </xsl:element>
+                    </xsl:if>
+                </xsl:for-each>
+                
+                <!-- author -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/PersonAuthor">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">author</xsl:attribute>
+                        <xsl:value-of select="@LastName" />
+                        <xsl:text>, </xsl:text>
+                        <xsl:value-of select="@FirstName" />
+                    </xsl:element>
+                </xsl:for-each>
+
+                <!-- author_sort -->
+                <xsl:element name="field">
+                    <xsl:attribute name="name">author_sort</xsl:attribute>
+                    <xsl:for-each select="/Opus/Rdr_Dataset/PersonAuthor">
+                        <xsl:value-of select="@LastName" />
+                        <xsl:text> </xsl:text>
+                        <xsl:value-of select="@FirstName" />
+                        <xsl:text> </xsl:text>
+                    </xsl:for-each>
+                </xsl:element>
+
+                <!-- fulltext -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/Fulltext_Index">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">fulltext</xsl:attribute>
+                        <xsl:value-of select="." />
+                    </xsl:element>
+                </xsl:for-each>
+
+                <!-- has fulltext -->
+                <xsl:element name="field">
+                    <xsl:attribute name="name">has_fulltext</xsl:attribute>
+                    <xsl:value-of select="/Opus/Rdr_Dataset/Has_Fulltext" />
+                </xsl:element>
+
+                <!-- IDs der Dateien, die mit nicht leerem Resultat extrahiert werden konnten -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/Fulltext_ID_Success">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">fulltext_id_success</xsl:attribute>
+                        <xsl:value-of select="."/>
+                    </xsl:element>
+                </xsl:for-each>
+
+                <!-- IDs der Dateien, die nicht erfolgreich extrahiert werden konnten -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/Fulltext_ID_Failure">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">fulltext_id_failure</xsl:attribute>
+                        <xsl:value-of select="."/>
+                    </xsl:element>
+                </xsl:for-each>
+
+                <!-- referee -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/PersonReferee">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">referee</xsl:attribute>
+                        <xsl:value-of select="@FirstName" />
+                        <xsl:text> </xsl:text>
+                        <xsl:value-of select="@LastName" />
+                    </xsl:element>
+                </xsl:for-each>
+
+                <!-- other persons (non-authors) -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/*">
+                    <xsl:if test="local-name() != 'Person' and local-name() != 'PersonAuthor' and local-name() != 'PersonSubmitter' and substring(local-name(), 1, 6) = 'Person'">
+                        <xsl:element name="field">
+                            <xsl:attribute name="name">persons</xsl:attribute>
+                            <xsl:value-of select="@FirstName" />
+                            <xsl:text> </xsl:text>
+                            <xsl:value-of select="@LastName" />
+                        </xsl:element>
+                    </xsl:if>
+                </xsl:for-each>
+
+                <!-- doctype -->
+                <xsl:element name="field">
+                    <xsl:attribute name="name">doctype</xsl:attribute>
+                    <xsl:value-of select="/Opus/Rdr_Dataset/@Type" />
+                </xsl:element>
+
+                <!-- subject (swd) -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/Subject[@Type = 'swd']">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">subject</xsl:attribute>
+                        <xsl:value-of select="@Value" />
+                    </xsl:element>
+                </xsl:for-each>
+
+                <!-- subject (uncontrolled) -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/Subject[@Type = 'uncontrolled']">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">subject</xsl:attribute>
+                        <xsl:value-of select="@Value" />
+                    </xsl:element>
+                </xsl:for-each>
+
+                <!-- belongs_to_bibliography -->
+                <xsl:element name="field">
+                    <xsl:attribute name="name">belongs_to_bibliography</xsl:attribute>
+                    <xsl:choose>
+                        <xsl:when test="/Opus/Rdr_Dataset/@BelongsToBibliography = 0" >
+                            <xsl:text>false</xsl:text>
+                       </xsl:when>
+                       <xsl:otherwise>
+                            <xsl:text>true</xsl:text>
+                       </xsl:otherwise>
+                    </xsl:choose>                    
+                </xsl:element>
+
+                <!-- collections: project, app_area, institute, ids -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/Collection">
+                    <xsl:choose>
+                        <xsl:when test="@RoleName = 'projects'">
+                            <xsl:element name="field">
+                                <xsl:attribute name="name">project</xsl:attribute>
+                                <xsl:value-of select="@Number" />
+                            </xsl:element>
+                            <xsl:element name="field">
+                                <xsl:attribute name="name">app_area</xsl:attribute>
+                                <xsl:value-of select="substring(@Number, 0, 2)" />
+                            </xsl:element>
+                        </xsl:when>
+                        <xsl:when test="@RoleName = 'institutes'">
+                            <xsl:element name="field">
+                                <xsl:attribute name="name">institute</xsl:attribute>
+                                <xsl:value-of select="@Name" />
+                            </xsl:element>
+                        </xsl:when>
+                    </xsl:choose>
+
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">collection_ids</xsl:attribute>
+                        <xsl:value-of select="@Id" />
+                    </xsl:element>
+                </xsl:for-each>
+
+                <!-- title parent -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/TitleParent">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">title_parent</xsl:attribute>
+                        <xsl:value-of select="@Value" />
+                    </xsl:element>
+                </xsl:for-each>
+
+                <!-- title sub -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/TitleSub">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">title_sub</xsl:attribute>
+                        <xsl:value-of select="@Value" />
+                    </xsl:element>
+                </xsl:for-each>
+
+                <!-- title additional -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/TitleAdditional">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">title_additional</xsl:attribute>
+                        <xsl:value-of select="@Value" />
+                    </xsl:element>
+                </xsl:for-each>
+                
+                <!-- series ids and series number per id (modeled as dynamic field) -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/Series">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">series_ids</xsl:attribute>
+                        <xsl:value-of select="@Id"/>
+                    </xsl:element>
+
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">
+                            <xsl:text>series_number_for_id_</xsl:text><xsl:value-of select="@Id"/>
+                        </xsl:attribute>
+                        <xsl:value-of select="@Number"/>
+                    </xsl:element>
+
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">
+                            <xsl:text>doc_sort_order_for_seriesid_</xsl:text><xsl:value-of select="@Id"/>
+                        </xsl:attribute>
+                        <xsl:value-of select="@DocSortOrder"/>
+                    </xsl:element>
+                </xsl:for-each>
+
+                <!-- creating corporation (single valued) -->
+                <xsl:if test="/Opus/Rdr_Dataset/@CreatingCorporation">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">creating_corporation</xsl:attribute>
+                        <xsl:value-of select="/Opus/Rdr_Dataset/@CreatingCorporation"/>
+                    </xsl:element>
+                </xsl:if>
+
+                <!-- contributing corporation (single valued) -->
+                <xsl:if test="/Opus/Rdr_Dataset/@ContributingCorporation">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">contributing_corporation</xsl:attribute>
+                        <xsl:value-of select="/Opus/Rdr_Dataset/@ContributingCorporation"/>
+                    </xsl:element>
+                </xsl:if>
+
+                <!-- publisher name (single valued) -->
+                <xsl:if test="/Opus/Rdr_Dataset/@PublisherName">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">publisher_name</xsl:attribute>
+                        <xsl:value-of select="/Opus/Rdr_Dataset/@PublisherName"/>
+                    </xsl:element>
+                </xsl:if>
+
+                <!-- publisher place (single valued) -->
+                <xsl:if test="/Opus/Rdr_Dataset/@PublisherPlace">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">publisher_place</xsl:attribute>
+                        <xsl:value-of select="/Opus/Rdr_Dataset/@PublisherPlace"/>
+                    </xsl:element>
+                </xsl:if>
+
+                <!-- identifier (multi valued) -->
+                <xsl:for-each select="/Opus/Rdr_Dataset/Identifier">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">identifier</xsl:attribute>
+                        <xsl:value-of select="@Value"/>
+                    </xsl:element>
+                </xsl:for-each>
+
+            </xsl:element>
+        </xsl:element>
+
+    </xsl:template>
+
+</xsl:stylesheet>
\ No newline at end of file
diff --git a/resources/views/frontend/dataset/show.blade.php b/resources/views/frontend/dataset/show.blade.php
index e68c5d8..fc0c9be 100644
--- a/resources/views/frontend/dataset/show.blade.php
+++ b/resources/views/frontend/dataset/show.blade.php
@@ -28,11 +28,11 @@
           <br /> 
           @endforeach
           @foreach ($contributors as $contributor)
-          <em>Contributor: {{ $contributors->full_name }}</em>
+          <em>Contributor: {{ $contributor->full_name }}</em>
           <br /> 
           @endforeach
           @foreach ($submitters as $submitter)
-          <em>Contributor: {{ $submitter->full_name }}</em>
+          <em>Submitter: {{ $submitter->full_name }}</em>
           <br /> 
           @endforeach