如清单1所示，这些元素包含关于每本图书的标题、作者、出版商、格式、主题和IS BN标识符的信息。

As Listing 1 illustrates, these elements enclose information on the title, authors, publisher, format, subject, and ISBN identifiers for each book.

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每一个主题的实体一定要有一个标识符。

Each topical entity must have an identifier.

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清单10中使用dc元素添加描述、主题、发布者、版权和标识符信息以便对rss提要分类。

In Listing 10, you used the DC elements to add description, subject, publisher, rights, and identifier information to help classify the contents of the RSS feed.

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