diff --git a/core/config/schema/core.data_types.schema.yml b/core/config/schema/core.data_types.schema.yml
index 5bba6ac..3bc0098 100644
--- a/core/config/schema/core.data_types.schema.yml
+++ b/core/config/schema/core.data_types.schema.yml
@@ -417,17 +417,16 @@ core.date_format.*:
 # Schema for the configuration of the String field type.
 
 field.string.storage_settings:
-  type: sequence
+  type: mapping
   label: 'String settings'
-  sequence:
-    - type: string
+  mapping:
+    max_length:
+      type: integer
+      label: 'Maximum length'
 
 field.string.field_settings:
   type: sequence
   label: 'String settings'
-  sequence:
-    - type: string
-      label: 'Setting'
 
 field.string.value:
   type: sequence
@@ -443,17 +442,12 @@ field.string.value:
 # Schema for the configuration of the  String (long) field type.
 
 field.string_long.storage_settings:
-  type: sequence
+  type: field.string.storage_settings
   label: 'String (long) settings'
-  sequence:
-    - type: string
 
 field.string_long.field_settings:
-  type: sequence
+  type: field.string.field_settings
   label: 'String (long) settings'
-  sequence:
-    - type: string
-      label: 'Setting'
 
 field.string_long.value:
   type: sequence
@@ -463,23 +457,22 @@ field.string_long.value:
       label: 'Default'
       mapping:
         value:
-          type: string
+          type: text
           label: 'Value'
 
 # Schema for the configuration of the URI field type.
 
 field.uri.storage_settings:
-  type: sequence
+  type: mapping
   label: 'URI settings'
-  sequence:
-    - type: string
+  mapping:
+    max_length:
+      type: integer
+      label: 'Maximum length'
 
 field.uri.field_settings:
   type: sequence
   label: 'URI settings'
-  sequence:
-    - type: string
-      label: 'Setting'
 
 field.uri.value:
   type: sequence
@@ -497,15 +490,10 @@ field.uri.value:
 field.created.storage_settings:
   type: sequence
   label: 'Created timestamp settings'
-  sequence:
-    - type: string
 
 field.created.field_settings:
   type: sequence
   label: 'Created timestamp settings'
-  sequence:
-    - type: string
-      label: 'Setting'
 
 field.created.value:
   type: sequence
@@ -515,7 +503,7 @@ field.created.value:
       label: 'Default'
       mapping:
         value:
-          type: string
+          type: integer
           label: 'Value'
 
 # Schema for the configuration of the Changed field type.
@@ -523,15 +511,10 @@ field.created.value:
 field.changed.storage_settings:
   type: sequence
   label: 'Changed timestamp settings'
-  sequence:
-    - type: string
 
 field.changed.field_settings:
   type: sequence
   label: 'Changed timestamp settings'
-  sequence:
-    - type: string
-      label: 'Setting'
 
 field.changed.value:
   type: sequence
@@ -541,10 +524,10 @@ field.changed.value:
       label: 'Default'
       mapping:
         value:
-          type: string
+          type: integer
           label: 'Value'
 
-# Schema for the configuration of the Entity refeference field type.
+# Schema for the configuration of the Entity reference field type.
 
 field.entity_reference.storage_settings:
   type: mapping