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In some parts of the world the PDFs get enriched with standardised XML. https://www.ferd-net.de/standards/what-is-zugferd/what-is-zu... (If you bill a government agency in Germany, the PDF has to contain the data in ZUGFeRD format.)

ZUGFeRD is part of EU's creatively titled eInvoicing [0] project, compatible implementations should exist in other EU countries sooner or later.

Wow our main supplier is German, and so is our tool supplier. I'll have to look into this.