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Does anyone know where <https://github.com/Kotlin/kotlinx.html/blob/master/buildSrc/src/main/resources/html_5.xsd|this> HTML5 xsd was extracted from? (or where I could get a proper xsd for HTML5, google wasn't fruitful at all)

HTML5 does not have a doctype definition or an XML schema definition. This is because, although it shares the same syntax as its predecessor HTML 4, HTML5 itself is neither based on SGML nor XML. It's a markup language in its own right.

That's why you won't find any official schema out there

it's also not a closed schema - the standard will continue evolving, and even if it didn't it allows for custom elements and attributes

For context, I'm after something structured that I could parse and generate html5 dsl builders. Xsd is just one of the formats out there. I don't expect to use it for validation.

there is Web IDL, although the one everybody uses is the (evolving) draft and it is about consistent DOM interfaces

I think any strongly typed HTML builder DSL will be necessarily incomplete

Isn't WEB IDL versioned at all? Also is there a single file version of it somewhere (for me to parse)?