Fails to parse path names starting with a question mark

[Hunga1]

I'm trying to parse an OpenAPI specification written in YAML that contains a path name that starts with a question mark, but the openapi.Parse function is returning the following error:

2022/07/31 22:47:56 [7:5] unexpected key name
       4 |   version: 1.0.0
       5 | openapi: 3.0.1
       6 | paths:? /images/meta/{ImageID}.json
               ^
       8 |   : description: Fetch a static image metadata
       9 |     get:
      10 |       description: Fetch static image metadata
      11 |       
exit status 1

Here is the OpenAPI specification that I'm using to produce the error:

info:
  description: Example API
  title: Example API
  version: 1.0.0
openapi: 3.0.1
paths:
  ? /images/meta/{ImageID}.json
  : description: Fetch a static image metadata
    get:
      description: Fetch static image metadata
      operationId: FetchImageMetadata
      parameters:
      - description: ID of the image
        in: path
        name: ImageID
        required: true
        schema:
          maxLength: 36
          minLength: 36
          type: string
          pattern: ^[0-9A-F]{8}-[0-9A-F]{4}-4[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$
      responses:
        '200':
          description: OK

The YAML seems to be valid syntax and is OpenAPI spec.