OR Selected Element：可以选择一条线，一条边，和一根轴。 Define as Default：定义默认值，保存它的参数，使用（Fast Multi-Instantiation）快速多重引用的命令时用他...
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If the user changes the value in a textbox or switches the selected element in a dropdown list, you can register an event handler and have code execute when the event is raised.
如果用户改变了文本框中的值或切换了下拉列表中的选定元素，您就能够注册一个事件处理程序，引发事件时，执行代码。
When a transformation is invoked, it begins with the UML model, package, class, interface, or enumeration element, depending on what was selected when the transformation was invoked.
当调用转换时，从uml模型、包、类、接口，或枚举元素开始，这依赖于您调用转换时选择的内容。
The transformation will operate on the selected element (or the entire model if no element is selected) and all of the elements that it contains.
转换将影响所选择的元素（或者如果没有选择元素，将包含整个模型）及该元素所包含的所有元素。
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