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@[app.post](http://app.post/)("/ojp2023", response_model=Ojp, tags=["Open Journey Planner"])
def echo(x: Ojp = XmlBody()) -> Ojp:
    return x
fastapi.exceptions.FastAPIError: Invalid args for response field! Hint: check that <class 'ojp.ojp.Ojp'> is a valid Pydantic field type. If you are using a return type annotation that is not a valid Pydantic field (e.g. Union[Response, dict, None]) you can disable generating the response model from the type annotation with the path operation decorator parameter response_model=None. Read more: https://fastapi.tiangolo.com/tutorial/response-model/

@dataclass
class HelloWorld:
    message: str = field(metadata={"example": "Foo","name": "Message", "type": "Element"})

@dataclass
class Ojp:
    """
    Root element for OJP messages based on SIRI message exchange protocol.
    """
    class Meta:
        name = "OJP"
        namespace = "http://www.siri.org.uk/siri"

    ojprequest: Optional[Ojprequest] = field(
        default=None,
        metadata={
            "name": "OJPRequest",
            "type": "Element",
        }
    )
    ojpresponse: Optional[Ojpresponse] = field(
        default=None,
        metadata={
            "name": "OJPResponse",
            "type": "Element",
        }
    )
    extensions: Optional[Extensions2] = field(
        default=None,
        metadata={
            "name": "Extensions",
            "type": "Element",
        }
    )
    version: str = field(
        init=False,
        default="1.1-dev",
        metadata={
            "type": "Attribute",
            "required": True,
        }
    )

from dataclasses import dataclass, field
from fastapi import APIRouter
from fastapi_xml import XmlBody
from fastapi_xml import NonJsonRoute

router = APIRouter()
router.route_class = NonJsonRoute

@dataclass
class HealthBody:
    message: str = field(metadata={"example": "Server Health","name": "Message", "type": "Element"})

@router.post('/health', response_model=HealthBody, tags=["Health"])
async def postHealth(x: HealthBody = XmlBody()) -> HealthBody:
    x.message += ' Healthy!'
    return x

{
  "detail": "Unknown property echo:message"
}