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xso: clarify behaviour when two fields match the same xml attribute

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Jonas Schäfer 2025-04-22 17:52:35 +02:00
commit 174eea5e5d
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xso/src/from_xml_doc.md
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@ -323,6 +323,14 @@ field type on which the `extract` is declared.
If `codec` is given, the given `codec` value must implement
[`TextCodec<T>`][`TextCodec`] where `T` is the type of the field.
If two (or more) `#[xml(attribute)]` metas match the same XML attribute,
unspecified behavior occurs during serialisation: only one of the values will
be in the output, but it is unspecified which of the two. (Due to indirections
when refering to `static` items for attribute namespaces and names, it is not
possible to check this at compile-time.) This behaviour also affects
attribute fields which match the special `xml:lang` attribute when used in
conjuction with a `#[xml(lang)]` field.
#### Example
```rust