diff --git a/Classes/Validation/AbstactDomDocumentValidator.php b/Classes/Validation/AbstactDomDocumentValidator.php
index c073d390..1054e946 100644
--- a/Classes/Validation/AbstactDomDocumentValidator.php
+++ b/Classes/Validation/AbstactDomDocumentValidator.php
@@ -34,6 +34,7 @@
 
 abstract class AbstactDomDocumentValidator extends AbstractDlfValidator
 {
+
     protected DOMXpath $xpath;
 
     public function __construct()
@@ -57,6 +58,5 @@ protected function createNodeValidator(?DOMNode $node): DomNodeValidator
         return new DomNodeValidator($this->xpath, $this->result, $node);
     }
 
-    protected abstract function isValidDocument();
-
+    abstract function isValidDocument();
 }
diff --git a/Classes/Validation/ApplicationProfileValidationStack.php b/Classes/Validation/ApplicationProfileValidationStack.php
index ec30b998..9ab3c46a 100644
--- a/Classes/Validation/ApplicationProfileValidationStack.php
+++ b/Classes/Validation/ApplicationProfileValidationStack.php
@@ -35,7 +35,8 @@
 use Slub\Dfgviewer\Validation\Mets\LogicalStructureValidator;
 use Slub\Dfgviewer\Validation\Mets\PhysicalStructureValidator;
 
-class ApplicationProfileValidationStack extends AbstractDlfValidationStack {
+class ApplicationProfileValidationStack extends AbstractDlfValidationStack
+{
     public function __construct()
     {
         parent::__construct(\DOMDocument::class);
diff --git a/Classes/Validation/Dom/DomNodeListValidator.php b/Classes/Validation/Dom/DomNodeListValidator.php
index 4edc6414..cb6fb1d1 100644
--- a/Classes/Validation/Dom/DomNodeListValidator.php
+++ b/Classes/Validation/Dom/DomNodeListValidator.php
@@ -41,6 +41,7 @@
  */
 class DomNodeListValidator
 {
+
     private string $expression;
 
     private ?DOMNode $contextNode;
@@ -130,7 +131,7 @@ public function validateHasNoneOrOne(): DomNodeListValidator
     private function addError(string $prefix): void
     {
         $message = $prefix . ' that matches the XPath expression "' . $this->expression . '"';
-        if($this->contextNode) {
+        if ($this->contextNode) {
             $message .= ' under "' . $this->contextNode->getNodePath() . '"';
         }
         $this->result->addError(new Error($message, 23));
diff --git a/Classes/Validation/Dom/DomNodeValidator.php b/Classes/Validation/Dom/DomNodeValidator.php
index a3fda971..392da9fe 100644
--- a/Classes/Validation/Dom/DomNodeValidator.php
+++ b/Classes/Validation/Dom/DomNodeValidator.php
@@ -40,6 +40,7 @@
  */
 class DomNodeValidator
 {
+
     protected DOMXPath $xpath;
 
     /**
diff --git a/Classes/Validation/Mets/AdministrativeMetadataValidator.php b/Classes/Validation/Mets/AdministrativeMetadataValidator.php
index 7c5944be..8626265c 100644
--- a/Classes/Validation/Mets/AdministrativeMetadataValidator.php
+++ b/Classes/Validation/Mets/AdministrativeMetadataValidator.php
@@ -89,8 +89,8 @@ protected function validateDigitalProvenanceMetadataNode(\DOMNode $digitalProven
             ->getFirstNode();
 
         $this->createNodeValidator($mdWrap)
-            ->validateHasAttributeWithValue('MDTYPE', array('OTHER'))
-            ->validateHasAttributeWithValue('OTHERMDTYPE', array('DVLINKS'));
+            ->validateHasAttributeWithValue('MDTYPE', ['OTHER'])
+            ->validateHasAttributeWithValue('OTHERMDTYPE', ['DVLINKS']);
 
         $this->createNodeListValidator('mets:xmlData[dv:links]', $mdWrap)
             ->validateHasOne();
diff --git a/Classes/Validation/Mets/DigitalRepresentationValidator.php b/Classes/Validation/Mets/DigitalRepresentationValidator.php
index 2995b312..d8a51934 100644
--- a/Classes/Validation/Mets/DigitalRepresentationValidator.php
+++ b/Classes/Validation/Mets/DigitalRepresentationValidator.php
@@ -45,7 +45,7 @@ public function isValidDocument(): void
             ->validateHasNoneOrOne();
 
         // If a physical structure is present, there must be one file section.
-        if($this->xpath->query(VH::XPATH_PHYSICAL_STRUCTURES)->length > 0){
+        if ($this->xpath->query(VH::XPATH_PHYSICAL_STRUCTURES)->length > 0) {
             $this->createNodeListValidator(VH::XPATH_FILE_SECTIONS)
                 ->validateHasOne();
         }
@@ -110,7 +110,7 @@ protected function validateFile(\DOMNode $file): void
             ->getFirstNode();
 
         $this->createNodeValidator($fLocat)
-            ->validateHasAttributeWithValue('LOCTYPE', array('URL', 'PURL'))
+            ->validateHasAttributeWithValue('LOCTYPE', ['URL', 'PURL'])
             ->validateHasAttributeWithUrl('xlink:href');
     }
 }