Variable with two types or more

It depends on the parameter location (in attribute).

 

Path, query, header, and form parameters in OpenAPI 2.0 require a specific type and cannot have multiple types.

 

However, in schemas for body parameters and responses, if you don't specify the type a schema, property, or array items schema, it means "any type" . That's the most you can do in OpenAPI 2.0.

 

definitions:
  MyModel:
    type: object
    properties:
      id:
        type: integer
        example: 1
      data:
        # No "type" means the value can be of any type
        example: 'custom data'

  ArrayOfArbitraryValues:
    type: array
    items: {}
    example: ['string', -1, false]