PDF+XML ZUGFeRD Folder 2 Schematron files Schema files Codelist XMLs EN16931 Folder 3 CEF Codelist Excel CEN Schematron UN/CEFACT Folder 4 Schema files XML Report ZUV Folder 5 PH-Schematron XML Metadata Metadata check XSLT files XSLT files Additional data Additional data check PH-Schematron Mustangproject Folder 1 PDFBox Mustang VeraPDF Folder 6 VeraPDF Schema check XSLT files PH-Schematron Intra-line calculation XRechnung Folder 7 Schematron