BOF: %PDF1.(0-7)
VAR: Identifies the byte sequence which equals - xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/ which is the PDF/A identification namespace within the PDF/A meta-data, followed by <pdfaid:part>3<pdfaid:part> and <pdfaid:conformance>U<pdfaid:conformance>, which are the two mandatory elements and values for PDF/A. See ISO 19005-3:2012 for further information.
BOF: %PDF1.(0-7) VAR: Identifies the byte sequence which equals - xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/ which is the PDF/A identification namespace within the PDF/A meta-data, followed by <pdfaid:conformance>U<pdfaid:conformance> and <pdfaid:part>3<pdfaid:part>, which are the two mandatory elements and values for PDF/A. See ISO 19005-3:2012 for further information.