![]() The metadata about a web page that is typically returned by a search engine (e.g., Google or Yahoo) includes brief sampling of the contents and its URL (universal resource locator). The metadata for an article in a periodical could include its title, subject, author, length, the name of the periodical, publication date, the section or page on which the article begins and whether or not it was peer reviewed. Some of this metadata appears on or in the book, and most or all of it also stored in databases about books, such as electronic card catalogs and reference books about books. Libraries usually add more metadata to a book after they purchase it, such as the date of acquisition, catalog number and copy number. Examples of types of locations in which metadata are commonly stored include computer databases, envelopes on letters, special pages on books (e.g., covers and title pages) and even bar codes and RFID (radio frequency identification) tags.įor example, metadata for a book includes its title, author, publisher, copyright date, location of printing, language, price, category, ISBN (international standard book number), number of pages and binding type. Metadata can be stored in various forms and in one or numerous locations. There is usually some extent of separation between data and its metadata. Metadata can include information about various aspects of the data that it describes, including its structure, content, quality, context, origin, ownership and condition. This is because the metadata is usually far smaller and easier to work with than the data that it represents. ![]() Metadata is used to organize, locate, manipulate and otherwise work with data when it is not necessary or desired to actually deal with the data itself. It can range from extremely simple single binary values (e.g., yes or no, or zero or one) to something so complex that only a few human minds can understand it (e.g., Einstein's theory of relativity). The pattern can be in any of a wide variety of forms, for example spoken or printed words, temperatures, visual images, pain, radioactivity, DNA, the structure of a crystal, color, or electron flows. Information can be broadly defined as any pattern that can be recognized by some system (e.g., a living organism, an electronic system or a mechanical device) and/or that can influence the formation or transformation of other patterns. Data is basically the same thing as information, although it is often in a form that is easier for humans and/or computers to use and manipulate. Metadata definition by The Linux Information Project LINFO
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