content Type XML and example not property handle

[LasneF]

Describe the bug
give an API Spec with a return content type set to application/xml spectral raise an error stating that example must be an object

notice that the file looks correct , and is correctly rendered by editor.swagger.io

To Reproduce
given the API spec below

{
    "openapi": "3.0.0",
    "info": {
        "title": "Kitten",
        "version": "1.0.0"
    },
    "paths": {
        "/pet": {
            "get": {
                "responses": {
                    "200": {
                        "description": "cat",
                        "content": {
                            "application/xml": {
                                "schema": {
                                    "$ref": "#/components/schemas/niceCatResult"
                                },
                                "example": "<Cat><nice>true</nice></Cat>"
                            }
                        }
                    }
                }
            }
        }
    },
    "components": {
        "schemas": {
            "niceCatResult": {
                "type": "object",
                "properties": {
                    "nice" : {
                        "type": "boolean"
                    }
                },
                "xml": {
                    "name": "Cat"
                }
            }
        }
    }
}

Error below is raised
18:44 error oas3-valid-media-example "example" property type must be object paths./pet.get.responses[200].content.application/xml.example

Expected behavior
No Error raised ,

[philsturgeon]

Also having this problem with examples and a value that's a string.

    responses:
        '201':
          description: Booking successful
          content:
            application/json:
              schema:
                allOf:
                  - $ref: '#/components/schemas/Booking'
                  - properties:
                      links:
                        $ref: '#/components/schemas/Links-Self'

              examples:
                new_booking:
                  summary: New Booking
                  value: |-
                    {
                      "id": "{{ uuid() }}",
                      "trip_id": "{{ request.body/trip_id }}",
                      "passenger_name": "{{ request.body/passenger_name }}",
                      "has_bicycle": {{ request.body/has_bicycle }},
                      "has_dog": {{ request.body/has_dog }},
                      "links": {
                        "self": "https://api.example.com/bookings/1725ff48-ab45-4bb5-9d02-88745177dedb"
                      }
                    }

This is allowed by the spec, and its eneded for using Microcks mocking tool, but I get this error:

  370:26        error  oas3-valid-media-example                       "value" property type must be object