1265 Acrobat PDF/A - Portable Document Format 2u Page Description The Portable Document Format/Archive is a format designed for long term preservation by Adobe Systems. PDF/A is an ISO standardised version of PDF, with all of the features from PDF that would impede long term preservation removed. A major principle of PDF/A is that it is self contained and not reliant on externalities thus all font and colour information is encoded into the file. PDF/A files are larger than other types of PDF files due to the need for embedded information. PDF/A2 supports three levels of compliance: PDF/A-2a (Accessible), PDF/A-2b (Basic). and PDF/A-2u (Unicode). The PDF/A-2 standard is a constrained subset of ISO 32000-1 (PDF 1.7), which includes PDF 1.0-1.7 and is defined by ISO 19005-2:2011, which has the formal name 'Document management – Electronic document file format for long-term preservation – Part 2: Use of ISO 32000-1 (PDF/A-2)'. 1 Digital Preservation Department / The National Archives 25 Oct 2012 11 Feb 2022 application/pdf MIME fmt/478 PUID pdf File extension 752 PDF/A-2U 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>2<pdfaid:part> and <pdfaid:conformance>U<pdfaid:conformance>, which are the two mandatory elements and values for PDF/A. See ISO 19005-2:2011 for further information. 1 Absolute from BOF 0 144 255044462D312E[30:37] 1 Variable 786D6C6E733A7064666169643D(22|27)687474703A2F2F7777772E6169696D2E6F72672F706466612F6E732F6964*7064666169643A70617274(3D22|3D27|3E)32(22|27|3C2F7064666169643A706172743E){0-120}7064666169643A636F6E666F726D616E6365(3E|3D22|3D27)55(22|27|3C2F7064666169643A636F6E666F726D616E63653E) 1957 PDF/A-2U 2 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>2<pdfaid:part>, which are the two mandatory elements and values for PDF/A. See ISO 19005-2:2011 for further information. 1 Absolute from BOF 0 144 255044462D312E[30:37] 1 Variable 786D6C6E733A7064666169643D(22|27)687474703A2F2F7777772E6169696D2E6F72672F706466612F6E732F6964*7064666169643A636F6E666F726D616E6365(3E|3D22|3D27)55(22|27|3C2F7064666169643A636F6E666F726D616E63653E){0-120}7064666169643A70617274(3D22|3D27|3E)32(22|27|3C2F7064666169643A706172743E) Has priority over 613 Acrobat PDF 1.0 - Portable Document Format Has priority over 614 Acrobat PDF 1.1 - Portable Document Format Has priority over 615 Acrobat PDF 1.2 - Portable Document Format Has priority over 616 Acrobat PDF 1.3 - Portable Document Format Has priority over 617 Acrobat PDF 1.4 - Portable Document Format Has priority over 618 Acrobat PDF 1.5 - Portable Document Format Has priority over 637 Acrobat PDF 1.6 - Portable Document Format Has priority over 869 TrueType Font Has priority over 1016 Acrobat PDF 1.7 - Portable Document Format Is subtype of 1016 Acrobat PDF 1.7 - Portable Document Format