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PDF's emphasis on preserving the visual appearance of documents across different software and hardware platforms poses challenges to the conversion of PDF documents to other file formats and the targeted extraction of information, such as text, images, tables, bibliographic information, and document metadata. Numerous tools and source code ...
Controlled vocabulary terms can accurately describe what a given document is actually about, even if the terms themselves do not occur within the document's text. Well known subject heading systems include the Library of Congress system , Medical Subject Headings (MeSH) created by the United States National Library of Medicine , and Sears .
One of the contentious issues surrounding the use of proprietary formats is the control of the files. [citation needed] If the information is stored in a way which the user's software provider tries to keep secret, the user may store the information by virtue of having generated it, but they have no way to retrieve it except by using a version of the original software which produced the file.
Eyes only is jargon used with regard to classified information.Whereas a classified document is normally intended to be available to readers with the appropriate security clearance and a need to know, an "eyes only" designation, whether official or informal, indicates that the document is intended only for a specific set of readers.
A defining vocabulary is a list of words used by lexicographers to write dictionary definitions. The underlying principle goes back to Samuel Johnson's notion that words should be defined using 'terms less abstruse than that which is to be explained', [1] and a defining vocabulary provides the lexicographer with a restricted list of high-frequency words which can be used for producing simple ...
Documents and other information must be properly marked "by the author" with one of several (hierarchical) levels of sensitivity—e.g. restricted, confidential, secret, and top secret. The choice of level is based on an impact assessment; governments have their own criteria, including how to determine the classification of an information asset ...
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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 ...