电子商务准备的是可以在互联网上看的目录，而不是实体的目录。
Instead of a physical catalog, e-commerce arranges for catalogs to be visible on the Internet.
第一种是对开拓围绕着可重用组件的目录服务和黄页的机遇感兴趣的商业实体。
The first could be any business entity interested in exploring the opportunities around directory services or yellow pages for reusable software components.
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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