Hammerwell on Nostr: Thanks. OCR should only be used as invisible 2nd layer. pdf/A shouldn't allow this. ...

Thanks. OCR should only be used as invisible 2nd layer. pdf/A shouldn't allow this. Version 1 had recognition errors which were corrected in v2. 3 and 4 allow for extra content, which is not advisable since it's unclear if it's accessible in the future. 2a should be choosen because of the accessibility requirement. Screen readers can read them properly.