問75
頻出度★★★
WebサイトなどでRSSという表記を見かけることがある。このRSSの説明として，適切なものはどれか。
平成24年度 春期 ITパスポート試験 問75
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This question's explanation and your answers so far.
解説
問 75
Incorrectア
“A markup language for defining layout styles for documents written in HTML” describes CSS (Cascading Style Sheets). CSS is a mechanism that separates appearance — font size, color, margins, placement, that is, the display style — from the HTML content itself and specifies it separately; it has no function for distributing update information. RSS does not define appearance: it is a format for describing and distributing the updated content itself in a set form, so their roles are different.
- イ
正解 The correct answer is イ. RSS (RDF Site Summary / Really Simple Syndication) is a general term for a family of XML-based formats used to write a web site's update information in a fixed form that machines can read. For each article it describes items such as the headline (title), the link (URL) to that article, a summary, and the update date and time in a set format, and the site publishes a file that collects them (an RSS feed). If users subscribe to that feed with an RSS reader or similar tool, they can receive all the new information together without visiting each site one by one. The description in choice イ, “A general term for formats that can describe a web page's headlines, links, summaries, and so on in a fixed format,” states exactly this role and form of RSS, so it is appropriate. Note also that RSS has several lines such as RSS 1.0 and RSS 2.0, and that together with the similar standard Atom they are called feeds, so the choice's use of the words general term also matches what RSS actually is.
Incorrectウ
“A technology that encrypts data flowing over the Internet to protect privacy information and the like” describes security technologies such as SSL / TLS (the encrypted communication used by HTTPS). Its purpose is to protect the content of communications from eavesdropping and tampering, not to structure and distribute update information the way RSS does. An RSS feed itself has no encryption function.
Incorrectエ
“A service that lets you share high-value website information with other users by registering bookmarks on the network” describes social bookmarking (an online bookmark-sharing service). It is a mechanism in which users manually register their own favorites and share them with one another, so compared with RSS — where the site side publishes update information in a set format — both who creates the information and the purpose are different.
ここがポイント
- RSS is a general term for formats that describe and distribute a web site's update information (headlines, links, summaries, update times, and so on) in a fixed, XML-based form; by subscribing with an RSS reader you can take in new items from many sites in one place.
- Tell confusable related terms apart by their roles: CSS = defines the display style of an HTML document; SSL / TLS = protects privacy by encrypting communication data; social bookmarking = a service for sharing bookmarks over the network.
用語