diff --git a/Admin/Install/attributes.json b/Admin/Install/attributes.json
new file mode 100644
index 0000000..03c0124
--- /dev/null
+++ b/Admin/Install/attributes.json
@@ -0,0 +1,77 @@
+[
+    {
+        "id": "color",
+        "name": {
+            "en": "Color",
+            "de": "Farbe"
+        },
+        "value_type": "string",
+        "is_custom_allowed": false,
+        "validation_pattern": "",
+        "is_required": false,
+        "default_value": "",
+        "values": [
+            {
+                "name": {
+                    "en": "Red",
+                    "de": "Rot"
+                }
+            },
+            {
+                "name": {
+                    "en": "Green",
+                    "de": "Gruen"
+                }
+            }
+        ]
+    },
+    {
+        "id": "length",
+        "name": {
+            "en": "Length",
+            "de": "Laenge"
+        },
+        "values": []
+    },
+    {
+        "id": "weight",
+        "name": {
+            "en": "Weight",
+            "de": "Gewicht"
+        },
+        "values": []
+    },
+    {
+        "id": "origin",
+        "name": {
+            "en": "Country of origin",
+            "de": "Herkunftsland"
+        },
+        "values": []
+    },
+    {
+        "id": "license",
+        "name": {
+            "en": "License",
+            "de": "Lizenz"
+        },
+        "values": []
+    },
+    {
+        "id": "payment_model",
+        "name": {
+            "en": "Payment Model",
+            "de": "Zahlungsweise"
+        },
+        "values": [
+            {
+                "en": "Subscription",
+                "de": "Abo"
+            },
+            {
+                "en": "pay-per-use",
+                "de": "Einmalzahlung"
+            }
+        ]
+    }
+]
\ No newline at end of file
diff --git a/Models/ItemAttributeType.php b/Models/ItemAttributeType.php
index df75861..89f5fbd 100755
--- a/Models/ItemAttributeType.php
+++ b/Models/ItemAttributeType.php
@@ -62,6 +62,7 @@ class ItemAttributeType implements \JsonSerializable
 
     public bool $isRequired = false;
 
+
     /**
      * Localization
      *
@@ -76,6 +77,14 @@ class ItemAttributeType implements \JsonSerializable
      */
     private array $defaults = [];
 
+    /**
+     * Default attribute value
+     *
+     * @var int
+     * @since 1.0.0
+     */
+    public int $default = 0;
+
     /**
      * Constructor.
      *
diff --git a/Models/ItemAttributeValue.php b/Models/ItemAttributeValue.php
index df59eb7..7f06290 100755
--- a/Models/ItemAttributeValue.php
+++ b/Models/ItemAttributeValue.php
@@ -85,6 +85,10 @@ class ItemAttributeValue implements \JsonSerializable
      */
     public bool $isDefault = false;
 
+    // @todo: The following l11n is bad!!!
+    // the l11n should be separate, because we want to know which value it is despite the l11n
+    // it should be basically the same ass the itemattributetype which has a itemattributetypel11n element.
+
     /**
      * Language
      *