- DatasetExtension.php save also Reference for datacite and dublin_core transformations

- oai:datacite.xslt für relatedIdentifiers
- oai: dc: datasetxml2oai-pmh.xslt für dc:relation
- dataset.php correct hasEmbargoPassed() method

app/Library/Xml/DatasetExtension.php

@@ -6,9 +6,9 @@ use App\Models\Description;
 use App\Models\License;
 use App\Models\Person;
 use App\Models\File;
-use App\Models\GeolocationBox;
 use App\Models\Coverage;
 use App\Models\Subject;
+use App\Models\DatasetReference;
 
 /**
  * DatasetExtension short summary.
@@ -65,6 +65,11 @@ trait DatasetExtension
             'relation' => 'persons',
             'fetch' => 'eager'
         ),
+        'Reference' => array(
+            'model' => DatasetReference::class,
+            'relation' => 'references',
+            'fetch' => 'eager'
+        ),
         'Subject' => array(
             'model' => Subject::class,
             'relation' => 'subjects',