And as you say, part of the language itself, which means no need to learn something different, and no need to learn a pseudo-HTML or lookalike like with JSX, which then needs to be actually parsed by the framework (or its dependencies), unlike SXML, which is already structured data, already understood perfectly in the same language and only needs to be rendered into HTML.
Have a look at: https://www.gnu.org/software/guile/manual/html_node/SXML.htm... or https://docs.racket-lang.org/sxml/SXML.html
And as you say, part of the language itself, which means no need to learn something different, and no need to learn a pseudo-HTML or lookalike like with JSX, which then needs to be actually parsed by the framework (or its dependencies), unlike SXML, which is already structured data, already understood perfectly in the same language and only needs to be rendered into HTML.