方法查阅近年来国内外公开发表的有关研究论文，按功能和调节作用分类汇总。
Method Study papers reported in Journals had been consulted, and classified by function and regulative effects.
为了方便地说明样式表中能够出现的各种元素的作用，按照第一次出现的深度进行分类。
To ease the discussion of the roles of various elements that can appear in a stylesheet, they are classified by the depth at which they first appear.
分类在与Registry and Repository的许多交互中起主要作用。
Classifications play a major role in many interactions with Registry and Repository.
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