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_comment_variable:
  type: migrate_source_sql
  label: 'Drupal 6 comment variable'
  mapping:
    constants:
      type: migrate_entity_constant
      label: 'Constants'