Meaning of @ImportedWithPrefix?

I'm trying to understand how styling works in CellTable. The line # 298 has BasicStyle annotated with @ImportedWithPrefix("gwt-CellTable"). I'm curious, how's 'gwt-CellTable' literal come into picture, and what does it do?

/**
* Styles used by {@link BasicResources}.
*/
@ImportedWithPrefix("gwt-CellTable")
interface BasicStyle extends Style {
/**
* The path to the default CSS styles used by this resource.
*/
String DEFAULT_CSS = "com/google/gwt/user/cellview/client/CellTableBasic.css";

}

Thanks!

Slava

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