description: Optional[str] = None
    variables: Optional[Dict[str, ServerVariable]] = None


class Reference(BaseModel):
    ref: str = Field(alias="$ref")


class Discriminator(BaseModel):
    propertyName: str
    mapping: Optional[Dict[str, str]] = None


class XML(BaseModelWithConfig):
    name: Optional[str] = None
    namespace: Optional[str] = None
    prefix: Optional[str] = None