例如，我们可以在互联网上建立一个说明运送事件的schema(数据视图)，邮寄是一种运输，加急邮件是一种邮政等等。
For example, we can create a schema on the web that expresses the information that there are shipping events, that mailing is a kind of shipping, that overnight-mailing is a kind of mailing, etc.
例如，我们可以在互联网上建立一个说明运送事件的schema(数据视图)，邮寄是一种运输，加急邮件是一种邮政等等。
For example, we can create a schema on the web that expresses the information that there are shipping events, that mailing is a kind of shipping, that overnight-mailing is a kind of mailing, etc.
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