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Content-based classification is classification in which the weight given to particular subjects in a document determines the class to which the document is assigned. It is, for example, a common rule for classification in libraries, that at least 20% of the content of a book should be about the class to which the book is assigned. [1]
Thus, no document remains classified for more than 50 years. This is mandated by the 2011 Information Access Law (Lei de Acesso à Informação), a change from the previous rule, under which documents could have their classification time length renewed indefinitely, effectively shuttering state secrets from the public. The 2011 law applies ...
Step 3 in the classification process is to assign a reason for the classification. Classification categories are marked by the number "1.4" followed by one or more letters (a) to (h): [50] [52] 1.4(a) military plans, weapons systems, or operations; 1.4(b) foreign government information; 1.4(c) intelligence activities, sources, or methods, or ...
Superintendent of Documents Classification took form around 1891, when Adelaide Hasse was given the task of organizing the government publications held at the Los Angeles Public Library. Rather than organize publications by subject, she instead organized them by provenance, that is, the government agency that issued them. [2]
The older system used five levels of classification, supplemented with caveat keywords. [4]: Annex One The keyword was placed in all capital letters in the centre of the top and bottom of each page of a classified document and described the foreseeable consequence of an unauthorised release of the data (a ‘breach of confidentiality’). In ...
In library and information science documents (such as books, articles and pictures) are classified and searched by subject – as well as by other attributes such as author, genre and document type. This makes "subject" a fundamental term in this field. Library and information specialists assign subject labels to documents to make them findable.
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This category is for articles about documents that were once classified, but have become known or partially known to the public. Articles on the classification process and its implications belong in the parent category, Category:Classified information,