diff --git a/core/modules/migrate/config/schema/migrate.source.schema.yml b/core/modules/migrate/config/schema/migrate.source.schema.yml
index b3314a4..c562ba2 100644
--- a/core/modules/migrate/config/schema/migrate.source.schema.yml
+++ b/core/modules/migrate/config/schema/migrate.source.schema.yml
@@ -4,232 +4,6 @@ migrate.source.*:
   type: migrate_source
   label: 'Default source'
 
-migrate.source.variable:
-  type: migrate_source_sql
-  label: 'Variable'
-  mapping:
-    variables:
-      type: sequence
-      label: 'Variables'
-      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_sql
-  label: 'Drupal 6 comment'
-  mapping:
-    constants:
-      type: mapping
-      label: 'Constants'
-      mapping:
-        entity_type:
-          type: string
-          label: 'Entity type'
-
-migrate.source.d6_comment_variable_per_comment_type:
-  type: migrate_source_sql
-  label: 'Drupal 6 comment variable'
-  mapping:
-    constants:
-      type: migrate_entity_constant
-      label: 'Constants'
-
-migrate.source.d6_comment_entity_form_display_subject:
-  type: migrate_source_sql
-  label: 'Drupal 6 comment subject entity form display'
-  mapping:
-    constants:
-      type: migrate_entity_constant
-      label: 'Constants'
-
-migrate.source.d6_box:
-  type: migrate_source_sql
-  label: 'Drupal 6 box'
-  mapping:
-    constants:
-      type: mapping
-      label: 'Constants'
-      mapping:
-        type:
-          type: string
-          label: 'Type'
-
-migrate.source.d6_taxonomy_vocabulary:
-  type: migrate_source_sql
-  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_sql
-  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_sql
-  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_sql
-  label: 'Drupal 6 field instance form display'
-  mapping:
-    constants:
-      type: migrate_entity_constant
-      label: 'Constants'
-
-migrate.source.d6_field:
-  type: migrate_source_sql
-  label: 'Drupal 6 box'
-  mapping:
-    constants:
-      type: migrate_entity_constant
-      label: 'Constants'
-
-migrate.source.variable_multirow:
-  type: migrate_source_sql
-  label: 'Drupal 6 box'
-  mapping:
-    variables:
-      type: sequence
-      label: 'Variables'
-      sequence:
-        - type: string
-          label: 'Variable'
-
-migrate.source.d6_comment_variable:
-  type: migrate_source_sql
-  label: 'Drupal 6 comment variable'
-  mapping:
-    constants:
-      type: migrate_entity_constant
-      label: 'Constants'
-
-migrate.source.d6_contact_settings:
-  type: migrate_source_sql
-  label: 'Drupal 6 contact settings'
-  mapping:
-    variables:
-      type: sequence
-      label: 'Variables'
-      sequence:
-        - type: string
-          label: 'Variable'
-
-migrate.source.d6_view_mode:
-  type: migrate_source_sql
-  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_sql
-  label: 'Drupal 6 profile field'
-  mapping:
-    constants:
-      type: migrate_entity_constant
-      label: 'Constants'
-
-migrate.source.d6_field_formatter_settings:
-  type: migrate_source_sql
-  label: 'Drupal 6 field formatter settings'
-  mapping:
-    constants:
-      type: migrate_entity_constant
-      label: 'Constants'
-
-migrate.source.d6_node_type:
-  type: migrate_source_sql
-  label: 'Drupal 6 node type'
-  mapping:
-    constants:
-      type: migrate_entity_constant
-      label: 'Constants'
-
-migrate.source.d6_node:
-  type: migrate_source_sql
-  label: 'Drupal 6 node'
-  mapping:
-    node_type:
-      # The node type can be specified both as a string ID of a node type or an
-      # array of node type IDs, so there is no way to consistently parse this.
-      type: ignore
-      label: 'Node type'
-
-migrate.source.d6_node_revision:
-  type: migrate_source_sql
-  label: 'Drupal 6 node'
-  mapping:
-    node_type:
-      # The node type can be specified both as a string ID of a node type or an
-      # array of node type IDs, so there is no way to consistently parse this.
-      type: ignore
-      label: 'Node type'
-
-migrate.source.d6_upload_instance:
-  type: migrate_source_sql
-  label: 'Drupal 6 upload form display'
-  mapping:
-    constants:
-      type: migrate_entity_constant
-      label: 'Constants'
-
-migrate.source.d6_field_instance:
-  type: migrate_source_sql
-  label: 'Drupal 6 field instance'
-  mapping:
-    constants:
-      type: migrate_entity_constant
-      label: 'Constants'
-
-migrate.source.d6_field_instance_per_view_mode:
-  type: migrate_source_sql
-  label: 'Drupal 6 field formatter'
-  mapping:
-    constants:
-      type: migrate_entity_constant
-      label: 'Constants'
-
 migrate.source.empty:
   type: migrate_source_sql
   label: 'Drupal 6 field formatter'
@@ -256,129 +30,3 @@ migrate.source.empty:
         display_field:
           type: boolean
           label: 'Display field'
-
-migrate.source.d6_user:
-  type: migrate_source_sql
-  label: 'Drupal 6 user'
-  mapping:
-    constants:
-      type: mapping
-      label: 'Constants'
-      mapping:
-        key:
-          type: string
-          label: 'User data key'
-        module:
-          type: string
-          label: 'Module name'
-
-migrate.source.d6_user_picture_file:
-  type: migrate_source_sql
-  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_sql
-  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'
-    preview:
-      type: integer
-      label: 'Preview'
-    create_body:
-      type: boolean
-      label: 'create body'
-    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/config/schema/migrate.source.schema.yml b/core/modules/migrate_drupal/config/schema/migrate_drupal.source.schema.yml
similarity index 91%
copy from core/modules/migrate/config/schema/migrate.source.schema.yml
copy to core/modules/migrate_drupal/config/schema/migrate_drupal.source.schema.yml
index b3314a4..5cd5619 100644
--- a/core/modules/migrate/config/schema/migrate.source.schema.yml
+++ b/core/modules/migrate_drupal/config/schema/migrate_drupal.source.schema.yml
@@ -1,8 +1,4 @@
-# Schema for the migrate source plugins.
-
-migrate.source.*:
-  type: migrate_source
-  label: 'Default source'
+# Schema for the migrate_drupal source plugins.
 
 migrate.source.variable:
   type: migrate_source_sql
@@ -111,7 +107,7 @@ migrate.source.d6_taxonomy_vocabulary_per_type:
 
 migrate.source.d6_field:
   type: migrate_source_sql
-  label: 'Drupal 6 box'
+  label: 'Drupal 6 field'
   mapping:
     constants:
       type: migrate_entity_constant
@@ -119,7 +115,7 @@ migrate.source.d6_field:
 
 migrate.source.variable_multirow:
   type: migrate_source_sql
-  label: 'Drupal 6 box'
+  label: 'Drupal variable multirow'
   mapping:
     variables:
       type: sequence
@@ -230,33 +226,6 @@ migrate.source.d6_field_instance_per_view_mode:
       type: migrate_entity_constant
       label: 'Constants'
 
-migrate.source.empty:
-  type: migrate_source_sql
-  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:
   type: migrate_source_sql
   label: 'Drupal 6 user'
@@ -380,5 +349,3 @@ migrate_entity_constant:
           sequence:
             - type: string
               label: 'Settings'
-
-