创建了规范树，由这个新的域拥有。
A canonical tree is created, which is owned by this new domain.
dom层为构造符合ODF标准规范的dom树提供基础。
The DOM layer provides a foundation for constructing the DOM tree that is compliant with the ODF standard specification.
如w3c规范中所描述的，xpath树模型包括属性和名称空间的节点。
The XPath tree model, as described in the W3C specification, includes nodes for attributes and namespaces.
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