ISDOC.PDF: an XML invoice in a PDF, and the VAT date it can't structure
ISDOC is the Czech national e-invoicing format. Here is how to embed it in a PDF/A-3, how to check the result, and where it falls short of the VAT Act: a summary tax document needs a date for each supply, and ISDOC 6.0.2 has one per document.
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