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A PDF file is organized using ASCII characters, except for certain elements that may have binary content. The file starts with a header containing a magic number (as a readable string) and the version of the format, for example %PDF-1.7. The format is a subset of a COS ("Carousel" Object Structure) format. [24]
PDF is a standard for encoding documents in an "as printed" form that is portable between systems. However, the suitability of a PDF file for archival preservation depends on options chosen when the PDF is created: most notably, whether to embed the necessary fonts for rendering the document; whether to use encryption; and whether to preserve additional information from the original document ...
PDF/X is a subset of the ISO standard for PDF. The purpose of PDF/X is to facilitate graphics exchange, and it therefore has a series of printing-related requirements which do not apply to standard PDF files. For example, in PDF/X-1a all fonts need to be embedded and all images need to be CMYK or spot colors.
International or global standards are agreements on common technical approaches that are used world-wide. Typical examples are: Internet standards — HTTP, SMTP, HTML, XML, etc. SI units of measure; Electrical power — 110V and 220V; A and AA battery sizes; GSM standard for mobile/cell phones; A0/A1/A2/A3/A4 paper sizes
These standards are conventionally accepted as best practice and used globally by industry and organizations. In circumstances and situations there are certain methods and systems that are used as benchmarks, guidelines or protocols for communication , measurement , orientation , reference for information , science , symbols and time .
Standard Version Released American Standard Code for Information Interchange: Atom: 1.0 Cascading Style Sheets (CSS) 2.1 2007/07/19 COLLADA: 1.5.0 [11] 2008/08 Common Information Model (CIM) 2.22 2009/06/25 Common Gateway Interface (CGI) 1.1 DocBook: 5.0 ECMAScript: 5.1 2011/06 Executable and Linking Format (ELF) 1.2 File Transfer Protocol (FTP)
ISO/IEC TR 10171:2000 Information technology – Telecommunications and information exchange between systems – List of standard data link layer protocols that utilize high-level data link control (HDLC) classes of procedures, list of standard XID format identifiers, list of standard mode-setting information field format identifiers, and list ...
Acrobat InProduction is a pre-press tools suite for Acrobat released by Adobe in 2000 to handle color separation and pre-flighting of PDF files for printing. Acrobat Messenger is a document utility for Acrobat users that was released by Adobe Systems in 2000 to convert paper documents into PDF files that can be e-mailed, faxed, or shared online.