BASIC ZUGFeRD-invoice.xml INVOICE 1.0 ZUGFeRD PDFA Extension Schema urn:ferd:pdfa:CrossIndustryDocument:invoice:1p0# zf DocumentFileName Text external name of the embedded XML invoice file DocumentType Text external INVOICE Version Text external The actual version of the ZUGFeRD XML schema ConformanceLevel Text external The conformance level of the embedded ZUGFeRD data