fn = () => {
  return {
    instruction: {
      enter: (node, parentNode) => {
        if (node.name === 'xml') {
          detachNodeFromParent(node, parentNode);
        }
      },
    },
  };
}
Remove XML Processing Instruction.

@example
<?xml version="1.0" encoding="utf-8"?>

@author Kir Belevich

@type {import('../lib/types.js').Plugin}