metadata

Metadata is data about data. An item of metadata may describe an individual datum, or content item, or a collection of data including multiple content items. Metadata (sometimes written 'meta data') is used to facilitate the understanding, use and management of data. The metadata required for effective data management varies with the type of data and context of use. In a library, where the data is the content of the titles stocked, metadata about a title would typically include a description of the content, the author, the publication date and the physical location. In the context of a camera, where the data is the photographic image, metadata would typically include the date the photograph was taken and details of the camera settings. On a portable music player such as an Apple iPod, the album names, song titles and album art embedded in the music files are used to generate the artist and song listings, and are metadata. In the context of an information system, where the data is the content of the computer files, metadata about an individual data item would typically include the name of the field and its length. Metadata about a collection of data items, a computer file, might typically include the name of the file, the type of file and the name of the data administrator.
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Une métadonnée (mot composé du préfixe grec meta, indiquant l'auto-référence ; le mot signifie donc proprement « donnée de/à propos de donnée ») est une donnée servant à définir ou décrire une autre donnée quel que soit son support (papier ou électronique).
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Als Metadaten oder Metainformationen bezeichnet man allgemein Daten, die Informationen über andere Daten enthalten. Bei den beschriebenen Daten handelt es sich oft um größere Datensammlungen (Dokumente) wie Bücher, Datenbanken oder Dateien. So werden auch Angaben von Eigenschaften eines Objektes (beispielsweise Personennamen) als Metadaten bezeichnet. Während der Begriff „Metadaten“ relativ neu ist, ist sein Prinzip unter anderem jahrhundertelange bibliothekarische Praxis.
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Metadane – czyli „dane o danych”, ich przykładem są klasyczne katalogi biblioteczne. Przy pomocy metadanych opisywane są dokumenty elektroniczne, w szczególności dokumenty dostępne poprzez sieci komputerowe, np. strony World Wide Web, a także dokumenty tworzące nowoczesne biblioteki cyfrowe. Jednym ze standardów metadanych jest Dublin Core Metadata Element Set (DCMES).
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Un metadato (dal greco meta- "oltre, dopo" e dal latino datum "informazione" - plurale: data), letteralmente "dato su un (altro) dato", è l'informazione che descrive un insieme di dati. Un esempio tipico di metadati è costituito dalla scheda del catalogo di una biblioteca, la quale contiene informazioni circa il contenuto e la posizione di un libro, cioè dati riguardanti i dati che si riferiscono al libro. Un altro contenuto tipico dei metadati può essere la fonte o l'autore dell'insieme di dati descritto oppure le modalità d'accesso, con le eventuali limitazioni.
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