> a simple test for determining if an XML schema is well designed: remove all tags and attributes from it ... If what you have left over does not make sense ... you shouldn't be using XML at all.

Magento 2 (acquired by Adobe for $1.68bn) uses XML to render its layouts. Here's some fun XML for the checkout page:

https://github.com/magento/magento2/blob/2.3-develop/app/cod...