791 Acrobat PDF/X - Portable Document Format - Exchange 3:2003 PDF/X-3:2003 Page Description This 'exchange standard' format is based on Adobe's PDF 1.4 (2003) specification and includes additional notes specifically for delivery of high quality colour advertisements. A subset of the PDF specification, and an application standard as well as a file format standard, it is considered a 'more reliable' PDF file. There are several versions of the standard, to address specific issues. Text 1 Digital Preservation Department / The National Archives 01 Feb 2007 22 Oct 2009 application/pdf MIME fmt/148 PUID pdf File extension 696 PDF/X-3:2003 BOF first 8 bytes: %PDF-1.4 Variable bytes: /GTS_PDFXVersion(PDF/X-3:2003) 1 Absolute from BOF 0 255044462D312E34 1 Variable 2F4754535F5044465856657273696F6E{0-1}285044462F582D333A3230303329 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 subsequent version of 819 Acrobat PDF/X - Portable Document Format - Exchange 3:2002 Is subtype of 617 Acrobat PDF 1.4 - Portable Document Format