By looking at the values specified in the DTD for that entity's system and public IDs, you can ensure that the same value is returned for all documents.

通过查看用于实体系统和公用标识的DTD中指定的值，可以确保对于所有文档返回相同的值。

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For example, an entity catalog can be used to specify the location from which an XML processor loads a DTD, given the system and public identifiers for that DTD.

比如，给定一个DTD的系统标识符和公共标识符，实体目录可用于规定XML处理程序从哪里加载dtd。

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For example, you can use an entity catalog to specify the location from which an XML processor loads a Document Type Definition (DTD), given the system and public identifiers for that DTD.

比如，给定一个DTD(文档类型定义，Document Type Definition)的系统标识符和公共标识符，实体目录(entity catalog)可用于规定XML处理程序从哪里加载dtd。

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