When first setting up a modeling project, a common request is to populate the catalog with information that may already exist in your organization, rather than having to input it all manually.
第一次设置建模项目时，一个常见要求是使用可能已存在于组织中的信息填充目录，而不是必须手动输入所有信息。
Modeling Product as a meta-class makes our model more flexible in that adding additional Products to the Catalog is purely a data-driven process and doesn't impact the class model.
将其他Product添加到Catalog完全是一个数据驱动过程，而且不会对类模型产生影响，因此将Product建模为一个元类会使我们的模型更加灵活。
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