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。

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.

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您可以回忆起在第1步中我们已经将标记处理程序类放到了classes目录中，所以我们实际上只需储存tld文件。

You will recall that we have already placed the tag handler class in the classes directory, in Step 1, so we actually only have to store the TLD file.

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linux子目录中的源文件中可能会有带有预处理程序指示符的代码形式，如下。

Source files in the Linux subdirectory could have a code layout with preprocessor directives as follows.

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