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RSS enclosures are a way of attaching multimedia content to RSS feeds by providing the URL of a file associated with an entry, such as an MP3 file to a music recommendation or a photo to a diary entry. Unlike e-mail attachments, enclosures are merely hyperlinks to files, the actual file data is not embedded into the feed (unless a data URL is used). Support and implementation among aggregators varies: if the software understands the specified file format, it may automatically download and display the content, otherwise provide a link to it or silently ignore it. The addition of enclosures to RSS, as first implemented by Dave Winer in late 2000 (), was an important prerequisite for the emergence of podcasting, arguably the most common use of the feature . In podcasts and related technologies enclosures are not merely attachments to entries, but provide the main content of a feed. == Syntax == In RSS 2.0, the syntax for the where the value of the ''url'' attribute is a URL of a file, ''length'' is its size in bytes, and ''type'' its mime type. It is recommended that only one 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「RSS enclosure」の詳細全文を読む スポンサード リンク
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