例如，我们可能想让系统显示用户公共信息的所有类型。

For example, we might want all types of a user's public information to be presented by the system.

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定义了“公共实体”模式的公共信息模型将成为这个类型系统中一个必不可少的部分。

The common information model that defines the schemas of the "common Entities" will be an essential part of this type system.

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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。

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.

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