openapi: 3.0.0
info:
  title: Example usage of components
  version: 1.0.0
paths: {}

components:
  parameters:  # Not global parameters
    limit:
      name: limit
      in: query
      description: A value used to limit the number of rows of data returned from a collection resource 
      schema:
        type: integer
    orderby:
      $ref:
        http://example.org/library.yaml#/components/parameters/orderby

  headers:  # Now reusable
    user-agent:
      description: An identifier for the client application using the API
      schema:
        type: string
        maxLength: 255

  schemas:  # renamed from definitions
    address:
      type: object
      properties:
        street:
          type: string
        city:
          type: string
        state:
          type: string
        country:
          type: string

  securitySchemes: # renamed from securityDefinitions
    oauth1: 
      type: http
      scheme: oauth
    digest:
      type: http
      scheme: digest