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[X] global xmlns #28969

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[X] global xmlns #28969

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StephaneDelcroix
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@StephaneDelcroix StephaneDelcroix commented Apr 14, 2025

Description of Change

Allow aggregating multiple xmlns into a single new global http://schemas.microsoft.com/dotnet/maui/global using XmlnsDefinition attribute, like this

[assembly: XmlnsDefinition("http://schemas.microsoft.com/dotnet/maui/global", "http://schemas.microsoft.com/dotnet/2021/maui")]

the x: xmlns can not be aggregated, as it serves important purposes for the parsers

this also brings #28090 to fix #28150

It uses a source generator, so this change is transparent to anyone consuming maui XAML, including tooling

Issues Fixed

@Copilot Copilot AI review requested due to automatic review settings April 14, 2025 10:00
@StephaneDelcroix StephaneDelcroix requested a review from a team as a code owner April 14, 2025 10:00
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Copilot reviewed 25 out of 28 changed files in this pull request and generated 2 comments.

Files not reviewed (3)
  • src/Controls/docs/Microsoft.Maui.Controls/XmlnsDefinitionAttribute.xml: Language not supported
  • src/Controls/src/Core/PublicAPI/net-ios/PublicAPI.Shipped.txt: Language not supported
  • src/Controls/src/Core/PublicAPI/net/PublicAPI.Shipped.txt: Language not supported

/// <include file="../../docs/Microsoft.Maui.Controls/XmlnsDefinitionAttribute.xml" path="//Member[@MemberName='AssemblyName']/Docs/*" />
public string AssemblyName { get; set; }
//TODO we need an analyzer to check before runtime
if (target == "http://schemas.microsoft.com/winfx/2009/xaml" || target == "http://schemas.microsoft.com/winfx/2006/xaml")
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The XmlnsDefinitionAttribute constructor now uses a 'target' parameter instead of 'clrNamespace', which is a breaking change. Please verify that all consumers are updated accordingly and that the documentation and tests reflect this change.

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@StephaneDelcroix StephaneDelcroix force-pushed the dev/stdelc/xmlnsaggregation branch from 21c132f to 2856e87 Compare April 24, 2025 15:02
@PureWeen PureWeen added this to the .NET 9 SR8 milestone May 8, 2025
@PureWeen PureWeen moved this from Todo to Ready To Review in MAUI SDK Ongoing May 8, 2025
@StephaneDelcroix StephaneDelcroix force-pushed the dev/stdelc/xmlnsaggregation branch 2 times, most recently from 6de9a5d to ec71e64 Compare May 19, 2025 10:29
Allow aggregating multiple xmlns into a single new global
http://schemas.microsoft.com/dotnet/maui/global using XmlnsDefinition
attribute, like this

```csharp
[assembly: XmlnsDefinition("http://schemas.microsoft.com/dotnet/maui/global", "http://schemas.microsoft.com/dotnet/2021/maui")]
```

the x: xmlns can not be aggregated, as it serves important purposes for
the parsers

this also brings #28090 to fix #28150

- fixes #28150
- fixes #28843
- closes #28090
@StephaneDelcroix
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closing in favour of #29579

@github-project-automation github-project-automation bot moved this from Ready To Review to Done in MAUI SDK Ongoing May 19, 2025
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xmlns aggregation XmlnsDefinitonAttribute is not supported for "this" assembly
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