You also need to import the ecore, ws, and util utility packages, used to load the models (as explained in the next step) and import special constructs.

你还需要导入ecore, ws和ut il实用程序包，它们被用来加载模型(将在下一步中作解释)并导入特殊结构。

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Util — Utility classes for such tasks as string manipulation, cookie management, data manipulation, deferred action support, and callback support.

ut il—字符串操作、cookie管理、数据操作、延迟动作支持和回调支持等任务的实用程序类。

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