定义模型的部分过程是标准化一组通用元数据属性（如标题、说明和作者等），这些属性是所有内容类型中所通用的。
Part of the process of defining the model was to standardize on a set of common metadata properties (such as title, description, authors, and so on) which are common across all content types.
通用标签也能提供有用的元数据(metadata)来描述各个对象间的相对关系。
Common Tag also provides access to useful metadata that defines each concept and describes how the concepts relate to one another.
更重要的是，通用标签的元数据互相连接，这使得内容发布者和开发者向最终用户呈现出更多相关内容。
What's more, Common Tag metadata connects concepts to one another, allowing publishers and developers to present end users with even more related content.
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