Remember that this entity reference is resolved through a DTD reference, and that at runtime it may turn into textual content, more XML content, or anything else.

记住，这个实体引用是通过DTD引用来解析的，并且在运行时它可以转换为文本内容、更多的XML内容或其它内容。

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It combines both the visual and textual aspects of the process in one single entity: the model.

它将流程的视觉方面和文本方面结合在了单个实体中：模型。

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