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Portable Document Format ( PDF ), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.

In select XML editors and management systems, the images and content can be viewed as rendered, through CSS mostly. ^ Presentational content is supported through SVG and MathML markup. In select XML editors, the images can be viewed as rendered. ^ Presentational markup is deprecated as of XHTML 1.0 and no longer allowed as of XHTML 1.1

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]

An open file format is a file format for storing digital data, [1] [2] defined by an openly published specification usually maintained by a standards organization, and which can be used and implemented by anyone. Open file format is licensed with open license. [3] For example, an open format can be implemented by both proprietary and free and ...

MHTML files use an .mhtml or .mht filename extension . The first part of the file is an e-mail header. The second part is normally HTML code. Subsequent parts are additional resources identified by their original uniform resource locators (URLs) and encoded in base64 binary-to-text encoding.