"ZUGFeRD leverages an important feature of PDF/A-3 (ISO 19005-3) which allows to embed attachments of arbitrary types into the PDF/A document" Oh - you mean I

"ZUGFeRD leverages an important feature of PDF/A-3 (ISO 19005-3) which allows to embed attachments of arbitrary types into the PDF/A document" Oh - you mean I can send documents that have arbitrary payloads to my tax office? That sounds interesting.