简单性：程序可以使用这些节点测试，选择基于共同组head元素或类型定义的一组元素，而不是逐一列举所有具体的元素名。
Simplicity: the program can use these node tests to select a group of elements based on their common group head element or type definition rather than enumerate all concrete element names one by one.
问答系统的研究试图使系统能回答较宽范围的问题，包括：事实、列举、定义、方式、原因、假设、语义约束和跨语言类型的问题。
QA research attempts to deal with a wide range of question types including: factoid, list, definition, how, why, hypothetical, semantically-constrained, and cross-lingual questions.
虽然有不同类型的企业博客，但主要分为外部企业博客和内部企业博客。还有很多对企业博客的定义，这里不一一列举。
Although there are many different types of corporate blogs, they are mostly categorized as either external or internal corporate blogs.
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