还有以题目分类的文章，包括生物差异性，核能，可持续性等。
A subject based article index is offered, covering topics such as biodiversity, climate, nuclear energy, sustainability, and transport.
另外还有一些更小的搜索引擎，例如按搜索题目分类显示结果的Clusty.com以及工业领域的先锋，由Bill Gross创立的SNAP.com。
There are also other, even smaller search engines, such as Clusty.com, a service that displays results in thematic bundles, and SNAP.com, an engine founded by Bill Gross, a pioneer in the industry.
另外，DITA还提供了进行分类的内容题目，以及与这些题目相关的其他信息的内容题目。
In addition, DITA provides the content topics that are classified and other information about those topics.
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