对于作者，元素列表变得更简单：文档设计者可以选择一些域来使元素集最小化。
Simpler element lists for authors: the document designer can select domains to minimize the element set.
通常情况下，设计者会选择这样的一组三个颜色：这种组合被称为颜色三角。
Typically, designers will choose colors like this in groups of three; this practice is known as selecting triads.
如过开发者认为自己是个好的设计者，选择了3，那就该在系统中使用3种颜色。
If someone thinks he is a good designer and he deserves a three on the scale, then he can go with 3 colors.
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