Descriptive metadata with recursion

openapi.yml

openapi: 3.0.0
info:
  description: Specification for Cocina Models
  version: 1.0.0
  title: Cocina Models
  license:
    name: Apache 2.0
    url: 'http://www.apache.org/licenses/LICENSE-2.0.html'
paths:
  /validate/DescriptiveBasicValue:
    post:
      summary: Validate a DescriptiveBasicValue
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/DescriptiveBasicValue'
      responses:
        '200':
          description: noop
components:
  schemas:
    DescriptiveBasicValue:
      description: Value model for descriptive elements without recursive properties.
      type: object
      additionalProperties: false
      properties:
        value:
          description: String value of the descriptive element.
          type: string
        type:
          description: Type of value provided by the descriptive element.
          type: string
        structuredValue:
          $ref: "#/components/schemas/DescriptiveStructuredValue"
    DescriptiveStructuredValue:
      description: Value model for descriptive elements structured as typed values.
      type: object
      additionalProperties: false
      properties:
        structuredValue:
          type: array
          items:
            $ref: "#/components/schemas/DescriptiveBasicValue"