您可能非常想利用象属性那样的语法把一些声明设置成外部实体中的缺省属性。
You may be tempted to exploit the attribute-like syntax to have some of your declarations set up as default attributes in an external entity.
通过使用缺省属性，您可以将所讨论的参数保留为空，缺省值将会自动分配到该参数。
By using the default attribute, you can leave the parameter in question blank and it is automatically assigned the default value.
核心组的这些缺省属性可以修改，在本文中对如何修改以及修改后的结果不作探讨。
These defaults are properties of the core group that can be modified, but a discussion of how to do this modification and the consequences of doing so are beyond the scope of this article.
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