boolean serialised with uppercase first letter

[maurosilber]

I'm not sure if this is an invalid XML, but in https://www.w3.org/TR/xmlschema-2/#boolean says that the valid values are {true, false, 1, 0}:

from pydantic_xml import BaseXmlModel, attr


class Model(BaseXmlModel):
    x: bool = attr()


print(
    Model
    .from_xml(b'<Model x="true" />')
    .to_xml()
    .decode()
)

<Model x="True"/>

[dapper91]

The library encodes values as is by default. But you can easily define your own encoding format for any type:

from typing import Annotated
from pydantic import PlainSerializer
from pydantic_xml import BaseXmlModel, attr

XmlBool = Annotated[bool, PlainSerializer(lambda val: str(val).lower())]


class Model(BaseXmlModel):
    x: XmlBool = attr()


print(Model.from_xml(b'<Model x="true" />').to_xml().decode())

[maurosilber]

Yes, I did that, thanks.

But shoudn't it by default encode the Python True as the string "true", which is what the XML specification says?

[dapper91]

@maurosilber Yes, that sounds reasonable, fixed it in version 2.3.0.