I get where product people will noisily demand this, but perhaps the idea of parsing even broken files successfully is a large part of the problem. HTML started

I get where product people will noisily demand this, but perhaps the idea of parsing even broken files successfully is a large part of the problem. HTML started this way, and it's still terrible. At an ancient job, we did a lot of scraping content from HTML as the de facto input source. Each content provider had to have custom code written, and it was as bad as you would expect. XML came about, and its largest advantage was that invalid input was broken, and must be rejected as such.