metatag-8.x-1.x-dev/metatag_custom_tags/config/schema/metatag_custom_tags.metatag_custom_tag.schema.yml

metatag_custom_tags.metatag_custom_tag.*:
  type: config_entity
  label: 'Custom tag'
  mapping:
    id:
      type: machine_name
      label: 'ID'
    label:
      type: label
      label: 'Label'
    description:
      type: string
      label: 'Description'
    htmlElement:
      type: string
      label: 'Element of the HTML tag. e.g. meta, link, etc.'
      constraints:
        Choice:
          - meta
          - link
    htmlValueAttribute:
      type: string
      label: 'The name of the html value attribute. e.g. content, href, charset, etc.'
      constraints:
        Choice:
          - content
          - charset
          - href
    attributes:
      type: sequence
      label: 'Additional attributes'
      sequence:
        type: mapping
        mapping:
          name:
            type: string
            label: 'Attribute name'
          value:
            type: string
            label: 'Attribute value'