Update to Drupal 8.0.0-beta15. For more information, see: https://www.drupal.org/node/2563023

core/modules/migrate/config/schema/migrate.data_types.schema.yml

@@ -27,7 +27,3 @@ migrate_source_sql:
     target:
       type: string
       label: 'The migration database target'
-
-migrate_load:
-  type: migrate_plugin
-  label: 'Load'

core/modules/migrate/config/schema/migrate.destination.schema.yml

@@ -16,19 +16,3 @@ migrate.destination.config:
     config_name:
       type: string
       label: 'Configuration name'
-
-migrate.destination.entity:user:
-  type: migrate_destination
-  label: 'User'
-  mapping:
-    md5_passwords:
-      type: boolean
-      label: 'Passwords'
-
-migrate.destination.entity:file:
-  type: migrate_destination
-  label: 'Picture'
-  mapping:
-    source_path_property:
-      type: string
-      label: 'Source path'

core/modules/migrate/config/schema/migrate.schema.yml

@@ -16,9 +16,6 @@ migrate.migration.*:
     label:
       type: label
       label: 'Label'
-    load:
-      type: migrate.load.[plugin]
-      label: 'Source'
     source:
       type: migrate.source.[plugin]
       label: 'Source'
@@ -28,6 +25,9 @@ migrate.migration.*:
     destination:
       type: migrate.destination.[plugin]
       label: 'Destination'
+    template:
+      type: string
+      label: 'Template'
     migration_dependencies:
       type: mapping
       label: 'Dependencies'

core/modules/migrate/config/schema/migrate.source.schema.yml

@@ -11,3 +11,24 @@ migrate.source.empty:
     provider:
       type: string
       label: 'Provider'
+
+migrate.source.embedded_data:
+  type: migrate_source
+  label: 'Embedded data source'
+  mapping:
+    data_rows:
+      type: sequence
+      label: 'Data rows'
+      sequence:
+        type: ignore
+        label: 'Data row'
+    ids:
+      type: sequence
+      label: 'Unique key'
+      sequence:
+        type: mapping
+        label: 'Key column'
+        mapping:
+          type:
+            type: string
+            label: 'Column type'