要导入 QML 类型到应用程序中，使用以下 import 语句在 .qml 文件中：
import QtScxml
更多信息，见 实例化状态机 .
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Connects to events sent out by state machines |
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Provices access to the services invoked by state machines |
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Provides an interface to the state machines created from SCXML files |
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Dynamically loads an SCXML document and instantiates the state machine |
