I have run into an issue with a custom XML DOCTYPE, where none of the elements seem to get registered by PHPStorm.
Thus, all I get is a ton of red. I have used the "ALT-ENTER -> Fetch DTD" method as advised in the documentation, which got rid of the DOCTYPE URI not being resolved... but the elements are still not considered valid. Is there anything else I need to do?
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ONIXmessage SYSTEM "http://www.editeur.org/onix/2.1/short/onix-international.dtd">