rules-8.x-3.x-dev/tests/modules/rules_test_ui_embed/config/schema/rules_test_ui_embed.schema.yml

rules_test_ui_embed.settings:
  type: config_object
  label: 'Rules Test UI embedding settings'
  mapping:
    conditions:
      type: rules_component
      label: Rules Conditions
    css:
      type: sequence
      sequence:
        type: mapping
        label: CSS files
        mapping:
          module:
            type: string
          file:
            type: string