项目通过类别进行识别，这帮助划分产品、特性或者项目交付的组件。
Projects are identified by a Category, which helps to classify the product, feature, or component that the project delivers.
在相同组件中定义的自订类别可以当做页面的根项目。
Custom classes cannot be used as the root element of a page if defined in the same assembly.
组件是视觉化样式项目类别的个别成员。
A part is a discrete member of a class of visual style elements.
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