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Uniform Type Identifier
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Uniform Type Identifier
A Uniform Type Identifier (UTI) is a text string used on software provided by Apple Inc. to uniquely identify a given class or type of item. Apple provides built-in UTIs to identify common system objects — document or image file types, folders and application bundles, streaming data, clipping data, movie data — and allows third party developers to easily add their own UTIs for application-specific or proprietary uses. Support for UTIs was added in the Mac OS X 10.4 operating system, integrated into the Spotlight desktop search technology, which uses UTIs to categorize documents. One of the primary design goals of UTIs was to eliminate the ambiguities and problems associated with inferring a file's content from its MIME type, filename extension, or type or creator code.
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Uniform Type Identifier
Un Uniform Type Identifier (UTI) è una stringa univoca che identifica un tipo di file. Aggiunti nel sistema operativo Mac OS X 10.4 Tiger della Apple Computer, gli UTI sono usati per identificare il tipo di file e cartelle, dati degli Appunti, bundle, symlink e dati in streaming. Gli UTI usano una struttura a dominio inverso, come public.text, o com.società.prodotto.formato. Gli UTI supportano l'ereditarietà multipla, che permette ai file multimedia di non essere identificati con un solo tipo (come in MIME), ma come tutti i tipi che effettivamente sono; un identificatore può ereditare da public.audio, public.video, public.text, public.image, etc.
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Uniform Type Identifier
Uniform Type Identifier (UTI) はデータ(エンティティ)のタイプ(種類、型)を一意に識別する文字列である。アップルコンピュータのMac OS X 10.4 から追加され、Spotlightなどでファイルやフォルダ、クリップボードのデータ、バンドル、エイリアス、シンボリックリンク、ストリーミングデータなどを識別するのに利用されている。UTIはドメイン名を逆さにした構造をしている。また、UTIはマルチメディアファイルが(MIMEのように)単一のタイプに識別されないように 多重継承を採用している。つまり1つの識別子は例えば public.audio, public.video, public.text, public.image など複数の識別子を継承できる。
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