Without the need for the external document, you no longer need Numbers for the steps.
由于不需要外部文档，因此不再需要对步骤进行编号。
The page area can also contain links to Web sites or external document repositories as needed.
根据需要，页面区域可以包含对Web站点或者外部文件存储库的链接。
Entities are references to data; depending on the kind of entity, the XML parser will either replace the entity reference with the entity's replacement text or the contents of an external document.
实体是对数据的引用；根据实体种类的不同，xml解析器将使用实体的替代文本或者外部文档的内容来替代实体引用。
The DTD can also live in an external document that is referenced by the document being parsed.
DTD还可以存在于要剖析之文件所参考的外部文件中。
The DTD can also live in an external document that is referenced by the document being parsed.
DTD还可以存在于要剖析之文件所参考的外部文件中。
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