diff --git a/core/modules/migrate/config/schema/migrate.data_types.schema.yml b/core/modules/migrate/config/schema/migrate.data_types.schema.yml
index 15e0581..efdee08 100644
--- a/core/modules/migrate/config/schema/migrate.data_types.schema.yml
+++ b/core/modules/migrate/config/schema/migrate.data_types.schema.yml
@@ -14,3 +14,7 @@ migrate_destination:
 migrate_source:
   type: migrate_plugin
   label: 'Source'
+
+migrate_load:
+  type: migrate_plugin
+  label: 'Load'
diff --git a/core/modules/migrate/config/schema/migrate.destination.schema.yml b/core/modules/migrate/config/schema/migrate.destination.schema.yml
index 00456ca..97cf48c 100644
--- a/core/modules/migrate/config/schema/migrate.destination.schema.yml
+++ b/core/modules/migrate/config/schema/migrate.destination.schema.yml
@@ -5,9 +5,25 @@ migrate.destination.*:
   label: 'Default destination'
 
 migrate.destination.config:
-  type: mapping
+  type: migrate_destination
   label: 'Config'
   mapping:
     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'
diff --git a/core/modules/migrate/config/schema/migrate.load.schema.yml b/core/modules/migrate/config/schema/migrate.load.schema.yml
new file mode 100644
index 0000000..aab9469
--- /dev/null
+++ b/core/modules/migrate/config/schema/migrate.load.schema.yml
@@ -0,0 +1,21 @@
+# Schema for the migrate load plugins.
+
+migrate.load.*:
+  type: migrate_load
+  label: 'Default load'
+
+migrate.load.drupal_entity:
+  type: migrate_load
+  label: 'Default source'
+  mapping:
+    bundle_migration:
+      type: string
+      label: 'Bundle migration'
+
+migrate.load.d6_term_node:
+  type: migrate_load
+  label: 'Default source'
+  mapping:
+    bundle_migration:
+      type: string
+      label: 'Bundle migration'
diff --git a/core/modules/migrate/config/schema/migrate.schema.yml b/core/modules/migrate/config/schema/migrate.schema.yml
index 6cf4847..cdca049 100644
--- a/core/modules/migrate/config/schema/migrate.schema.yml
+++ b/core/modules/migrate/config/schema/migrate.schema.yml
@@ -10,6 +10,9 @@ migrate.migration.*:
     label:
       type: label
       label: 'Label'
+    load:
+      type: migrate.load.[plugin]
+      label: 'Source'
     source:
       type: migrate.source.[plugin]
       label: 'Source'
diff --git a/core/modules/migrate/config/schema/migrate.source.schema.yml b/core/modules/migrate/config/schema/migrate.source.schema.yml
index c748bac..b0ff9e7 100644
--- a/core/modules/migrate/config/schema/migrate.source.schema.yml
+++ b/core/modules/migrate/config/schema/migrate.source.schema.yml
@@ -5,7 +5,7 @@ migrate.source.*:
   label: 'Default source'
 
 migrate.source.variable:
-  type: mapping
+  type: migrate_source
   label: 'Variable'
   mapping:
     variables:
@@ -14,6 +14,28 @@ migrate.source.variable:
       sequence:
         - type: string
           label: 'Variable'
+    constants:
+      type: mapping
+      label: 'Constants'
+      mapping:
+        entity_type:
+          type: string
+          label: 'Entity type'
+        id:
+          type: string
+          label: 'ID'
+        label:
+          type: label
+          label: 'Label'
+        description:
+          type: text
+          label: 'Description'
+        path:
+          type: string
+          label: 'Path'
+        plugin:
+          type: string
+          label: 'Plugin'
 
 migrate.source.d6_comment:
   type: migrate_source
@@ -62,3 +84,305 @@ migrate.source.d6_comment_variable:
         name:
           type: label
           label: 'Name'
+
+migrate.source.d6_comment:
+  type: migrate_source
+  label: 'Drupal 6 comment'
+  mapping:
+    constants:
+      type: mapping
+      label: 'Constants'
+      mapping:
+        field_name:
+          type: string
+          label: 'Field name'
+        comment_type:
+          type: string
+          label: 'Comment type'
+        entity_type:
+          type: string
+          label: 'Entity type'
+
+migrate.source.d6_box:
+  type: migrate_source
+  label: 'Drupal 6 box'
+  mapping:
+    constants:
+      type: mapping
+      label: 'Constants'
+      mapping:
+        type:
+          type: string
+          label: 'Type'
+
+migrate.source.d6_taxonomy_vocabulary:
+  type: migrate_source
+  label: 'Drupal 6 field instance form display'
+  mapping:
+    constants:
+      type: migrate_entity_constant
+      label: 'Constants'
+
+migrate.source.d6_field_instance_per_form_display:
+  type: migrate_source
+  label: 'Drupal 6 field instance form display'
+  mapping:
+    constants:
+      type: migrate_entity_constant
+      label: 'Constants'
+
+migrate.source.d6_taxonomy_vocabulary_per_type:
+  type: migrate_source
+  label: 'Drupal 6 field instance form display'
+  mapping:
+    constants:
+      type: migrate_entity_constant
+      label: 'Constants'
+
+migrate.source.d6_taxonomy_vocabulary_per_type:
+  type: migrate_source
+  label: 'Drupal 6 field instance form display'
+  mapping:
+    constants:
+      type: migrate_entity_constant
+      label: 'Constants'
+
+migrate.source.d6_field:
+  type: migrate_source
+  label: 'Drupal 6 box'
+  mapping:
+    constants:
+      type: migrate_entity_constant
+      label: 'Constants'
+
+migrate.source.variable_multirow:
+  type: migrate_source
+  label: 'Drupal 6 box'
+  mapping:
+    variables:
+      type: sequence
+      label: 'Variables'
+      sequence:
+        - type: string
+          label: 'Variable'
+
+migrate.source.d6_comment_variable:
+  type: migrate_source
+  label: 'Drupal 6 comment variable'
+  mapping:
+    constants:
+      type: migrate_entity_constant
+      label: 'Constants'
+
+migrate.source.d6_contact_settings:
+  type: migrate_source
+  label: 'Drupal 6 contact settings'
+  mapping:
+    variables:
+      type: sequence
+      label: 'Variables'
+      sequence:
+        - type: string
+          label: 'Variable'
+
+migrate.source.d6_view_mode:
+  type: migrate_source
+  label: 'Drupal 6 view mode'
+  mapping:
+    constants:
+      type: mapping
+      label: 'Constants'
+      mapping:
+        targetEntityType:
+          type: string
+          label: 'Target entity type'
+        status:
+          type: boolean
+          label: 'Status'
+
+migrate.source.d6_profile_field:
+  type: migrate_source
+  label: 'Drupal 6 profile field'
+  mapping:
+    constants:
+      type: migrate_entity_constant
+      label: 'Constants'
+
+migrate.source.d6_field_formatter_settings:
+  type: migrate_source
+  label: 'Drupal 6 field formatter settings'
+  mapping:
+    constants:
+      type: migrate_entity_constant
+      label: 'Constants'
+
+migrate.source.d6_node_type:
+  type: migrate_source
+  label: 'Drupal 6 node type'
+  mapping:
+    constants:
+      type: mapping
+      label: 'Constants'
+      mapping:
+        preview:
+          type: integer
+          label: 'Preview'
+        create_body:
+          type: boolean
+          label: 'create body'
+
+migrate.source.d6_upload_instance:
+  type: migrate_source
+  label: 'Drupal 6 upload form display'
+  mapping:
+    constants:
+      type: migrate_entity_constant
+      label: 'Constants'
+
+migrate.source.d6_field_instance:
+  type: migrate_source
+  label: 'Drupal 6 field instance'
+  mapping:
+    constants:
+      type: migrate_entity_constant
+      label: 'Constants'
+
+migrate.source.d6_field_instance_per_view_mode:
+  type: migrate_source
+  label: 'Drupal 6 field formatter'
+  mapping:
+    constants:
+      type: migrate_entity_constant
+      label: 'Constants'
+
+migrate.source.empty:
+  type: migrate_source
+  label: 'Drupal 6 field formatter'
+  mapping:
+    provider:
+      type: string
+      label: 'Provider'
+    constants:
+      type: mapping
+      label: 'Constants'
+      mapping:
+        entity_type:
+          type: string
+          label: 'Entity type'
+        type:
+          type: string
+          label: 'Type'
+        name:
+          type: string
+          label: 'Name'
+        cardinality:
+          type: integer
+          label: 'Cardinality'
+        display_field:
+          type: boolean
+          label: 'Display field'
+
+migrate.source.d6_user_picture_file:
+  type: migrate_source
+  label: 'Drupal 6 user picure display'
+  mapping:
+    constants:
+      type: mapping
+      label: 'Constant'
+      mapping:
+        is_public:
+          type: boolean
+          label: 'Public'
+
+migrate.source.d6_user_picture_instance:
+  type: migrate_source
+  label: 'Drupal 6 user picure display'
+  mapping:
+    provider:
+      type: string
+      label: 'Provider'
+    constants:
+      type: migrate_entity_constant
+      label: 'Constants'
+
+migrate_entity_constant:
+  type: mapping
+  mapping:
+    entity_type:
+      type: string
+      label: 'Entity type'
+    bundle:
+      type: string
+      label: 'Bundle'
+    label:
+      type: label
+      label: 'Label'
+    id:
+      type: string
+      label: 'ID'
+    view_mode:
+      type: string
+      label: 'View mode'
+    form_mode:
+      type: string
+      label: 'Form mode'
+    field_name:
+      type: string
+      label: 'Field name'
+    empty:
+      type: sequence
+      label: 'Empty'
+      sequence:
+        - type: string
+          label: 'Empty'
+    name:
+      type: string
+      label: 'Name'
+    required:
+      type: boolean
+      label: 'Required'
+    type:
+      type: string
+      label: 'Type'
+    cardinality:
+      type: integer
+      label: 'Cardinality'
+    parent:
+      type: integer
+      label: 'Parent'
+    langcode:
+      type: string
+      label: 'Type'
+    third_party_settings:
+      type: sequence
+      label: 'Settings'
+      sequence:
+        - type: ignore
+          label: 'Settings'
+    settings:
+      type: sequence
+      label: 'Settings'
+      sequence:
+        - type: ignore
+          label: 'Settings'
+    options:
+      type: mapping
+      label: 'Options'
+      mapping:
+        label:
+          type: string
+          label: 'label'
+        type:
+          type: string
+          label: 'Type'
+        weight:
+          type: integer
+          label: 'Weight'
+        settings:
+          type: sequence
+          label: 'Settings'
+          sequence:
+            - type: string
+              label: 'Settings'
+
+
diff --git a/core/modules/migrate_drupal/config/install/migrate.migration.d6_contact_settings.yml b/core/modules/migrate_drupal/config/install/migrate.migration.d6_contact_settings.yml
index 65b0082..e45dde1 100644
--- a/core/modules/migrate_drupal/config/install/migrate.migration.d6_contact_settings.yml
+++ b/core/modules/migrate_drupal/config/install/migrate.migration.d6_contact_settings.yml
@@ -15,5 +15,6 @@ process:
 destination:
   plugin: config
   config_name: contact.settings
-dependencies:
-  - d6_contact_category
+migration_dependencies:
+  required:
+    - d6_contact_category