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File format. 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.
Full function PDF specification means that it is not only a subset of Adobe PDF specification; in the case of ISO 32000-1 the full function PDF includes everything defined in Adobe's PDF 1.7 specification.
PDF/A is an ISO -standardized version of the Portable Document Format (PDF) specialized for use in the archiving and long-term preservation of electronic documents. PDF/A differs from PDF by prohibiting features unsuitable for long-term archiving, such as font linking (as opposed to font embedding) and encryption. [1]
PDF/UA is not a separate file-format but simply a way to use the familiar PDF format invented by Adobe Systems and now standardized as ISO 32000. In general PDF/UA requires Tagged PDF (ISO 32000-1, 14.8), but adds a variety of qualitative requirements, especially regarding semantic correctness of the tags employed:
ISO standards include PDF/X (eXchange), PDF/A (Archive), PDF/E (Engineering), ISO 32000 (PDF), PDF/UA (Accessibility) and PDF/VT (Variable data and transactional printing). PDF is readable on almost every platform with free or open source readers.
A file format is a standard way that information is encoded for storage in a computer file. It specifies how bits are used to encode information in a digital storage medium. File formats may be either proprietary or free .
The Open Document Format for Office Applications ( ODF ), also known as OpenDocument, standardized as ISO 26300, is an open file format for word processing documents, spreadsheets, presentations and graphics and using ZIP -compressed [6] XML files.
Because PDF documents can easily be viewed and printed by users on a variety of computer platforms, they are very common on the Internet and in document management systems worldwide. The current PDF specification, ISO 32000-1:2008, is available from ISO's website, and under special arrangement, without charge from Adobe.
Sometimes a guide or a standard operating procedure is available to help write and format a good specification. [10] [11] [12] A specification might include: Descriptive title, number, identifier, etc. of the specification. Date of last effective revision and revision designation.
The Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware, and operating systems. Each PDF file encapsulates a complete description of the presentation of the document, including the text, fonts, graphics, and other information needed to display it.