其它的组件可以通过指定名称检索值。
Other components can retrieve the value by specifying the name.
可按大洲或国家名称检索。
遇到实体引用时，取得实体声明并根据名称检索缓存的符号声明。
When an entity reference is encountered, you obtain its entity declaration and retrieve the cached notation declaration by its name.
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