Problem when deserializing attribute when using namespaces

[mat813]

I am trying to use xml_serde with attributes in namespaces, and I encounter a problem, with this code:

use serde::{Deserialize, Serialize};

#[derive(Debug, Serialize, Deserialize)]
struct Test {
    #[serde(rename = "{domain}stuff")]
    stuff: InnerTest,
}

#[derive(Debug, Serialize, Deserialize)]
struct InnerTest {
    #[serde(rename = "$attr:{domain}a")]
    pub attribute: i32,
    #[serde(rename = "$value")]
    pub value: String,
}

fn main() -> Result<()> {
    let xml = xml_serde::to_string(&Test {
        stuff: InnerTest {
            attribute: 123,
            value: "foobar".to_string(),
        },
    }).unwrap();

    println!("{xml}");

    let test: xml_serde::Result<Test> = xml_serde::from_string(xml);

    println!("{test:?}");
    Ok(())
}

And it outputs:

<?xml version="1.0" encoding="UTF-8"?>
<stuff xmlns="domain" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="domain domain.xsd" a="123">foobar</stuff>
Err(Message("missing field `$attr:{domain}a`"))

So, serialization is ok, the generated xml is correct, but when deserializing the attribute, it seems that it has "forgotten" there was a default namespace, and it fails.

[kornelski]

https://www.w3.org/TR/xml-names/#defaulting

6.2 Namespace Defaulting
[…]
The namespace name for an unprefixed attribute name always has no value.

[mat813]

Ok, but then the serialization is not valid.

[Taza53]

I am having the same issue.
It doesn't serialize or deserialize, any attributes of xmlns.

xml
xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xsi:schemaLocation=\"http://www.sie.se/sie5 http://www.sie.se/sie5.xsd\" xmlns=\"http://www.sie.se/sie5\"

struct
xmlns_xsi: "", xmlns_xsd: "", xsi_schema_location: "http://www.sie.se/sie5 http://www.sie.se/sie5.xsd", xmlns: ""

#[derive(Debug, Default, PartialEq, Serialize, Deserialize)]
#[serde(rename = "SieEntry")]
pub struct SieEntrySerde {
    #[serde(default, rename = "@xmlns:xsi")]
    xmlns_xsi: String,
    #[serde(default, rename = "@xmlns:xsd")]
    xmlns_xsd: String,
    #[serde(default, rename = "@xsi:schemaLocation")]
    xsi_schema_location: String,
    #[serde(default, rename = "@xmlns")]
    xmlns: String,
    #[serde(rename = "FileInfo")]
    pub file_info: FileInfo,
}