diff --git a/install/samples/books/2_types/Date.json b/install/samples/books/2_types/Date.json
new file mode 100644
index 0000000..1543f26
--- /dev/null
+++ b/install/samples/books/2_types/Date.json
@@ -0,0 +1,4 @@
+{
+    "name": "Datum",
+    "validation": "\\d{2}\\.\\d{2}\\.\\d{4}"
+}
\ No newline at end of file
diff --git a/install/samples/books/2_types/ISBN13.json b/install/samples/books/2_types/ISBN13.json
new file mode 100644
index 0000000..dee6026
--- /dev/null
+++ b/install/samples/books/2_types/ISBN13.json
@@ -0,0 +1,4 @@
+{
+    "name": "ISBN-13",
+    "validation": "\\d{3}\\-\\d{1}\\-\\d{2}\\-\\d{6}\\-\\d{1}"
+}
\ No newline at end of file
diff --git a/install/samples/books/5_schemas/Books_Schema.json b/install/samples/books/5_schemas/Books_Schema.json
index f34770f..6401e6c 100644
--- a/install/samples/books/5_schemas/Books_Schema.json
+++ b/install/samples/books/5_schemas/Books_Schema.json
@@ -5,7 +5,7 @@
             "typeId": {{types_Number}},
             "required": true,
             "unique": true,
-            "mainEntry": true,
+            "mainEntry": false,
             "titleField": false
         },
         {
@@ -13,7 +13,7 @@
             "typeId": {{types_Anything}},
             "required": true,
             "unique": true,
-            "mainEntry": false,
+            "mainEntry": true,
             "titleField": true,
             "translationDefinitions": [
                 {
@@ -33,6 +33,22 @@
                 }
             ]
         },
+        {
+            "name": "ISBN",
+            "typeId": {{types_ISBN13}},
+            "required": true,
+            "unique": true,
+            "mainEntry": false,
+            "titleField": false
+        },
+        {
+            "name": "Veröffentlichung",
+            "typeId": {{types_Date}},
+            "required": false,
+            "unique": false,
+            "mainEntry": false,
+            "titleField": false
+        },
         {
             "name": "Autoren",
             "referenceVocabularyId": {{vocabularies_Authors}},