Listing 4 provides a simple helloworld WSDL file that represents an example service.
清单4提供了代表示例服务的简单helloworld WSDL文件。
You will likely have to create the helloworld directory, but the parent directories will already be there.
您可能需要创建helloworld目录，但父目录可能已经存在了。
You can skip the rest of the chapter for now if you want to jump right into the code and customize the helloworld project for your own small database application.
如果开发者为了自己的小型数据库应用想立即编码和定制helloworld项目，那么现在就可以跳过本章的剩余部分。
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