规范化数据模型以规范化方式描述业务实体、属性和关系，以反映它们的业务用途。
The canonical data model describes the business entities, attributes, and relationships in a normalized form structured to reflect their business use.
还将按照dtd类型规则规范化属性，但这主要与使用DTD的文档有关，本文不再讨论。
Attributes are also normalized according to rules for their DTD type, but this mostly affects documents that use a DTD, which I do not cover in this article.
在属性规范化后，可以依靠的属性中的每个记号是通过空白来与其邻居区分开来。
After normalization of attributes, you can count on every token in an attribute being separated from its neighbors by whitespace.
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