[pinky07]

The invoicing standard in France and Germany (factur-x) embed the XML inside the PDF, which is very convenient.

Here is a python lib that does it: https://pypi.org/project/factur-x/

Odoo, an open source invoicing software, produces factur-x invoices systematically (whatever the country): very convenient as it's parsed automatically.

[im3w1l]

Invoices in Sweden have a design created for easy OCR-scanning. I prefer this way because it means that there can be no discrepancy between what I see and what the machine sees.

Another benefit is that it's really easy to recognize an invoice at a glance, and you know exactly where all the info is.