added a validator class

classes/CSVXMLValidator.php

@@ -0,0 +1,27 @@
+<?PHP
+/**
+ * Contains a helper class for validation errors.
+ *
+ * @author Nathan Eikermann <nathan@museum-digital.de>
+ */
+declare(strict_types = 1);
+/**
+ * Class holding the information about various errors
+ * that can occur during validation 
+ */
+final class CSVXMLValidator
+{
+    public array $error_msgs;
+    public array $inv_errors;
+    public array $depcon_errors;
+    
+    /**
+     * Constructor
+     */ 
+    public function __construct()
+    {
+        $error_msgs = [];
+        $inv_errors = [];
+        $depcon_errors = [];
+    }
+}