它是一种极具成本效益的替代实体以太网连接的前沿设备。

It is a cost-effective alternative to physical connections to Ethernet edge equipment.

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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。

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.

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如果可以获取实体引用内容的本地副本，或者需要用自己的内容替代实体引用，请使用SAX EntityResolver接口。

If you can obtain local copies of entity reference content, or if you need to substitute your own content for an entity reference, use the SAX EntityResolver interface.

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