只操作顶层走线的表达式为：expr=IsTrack and OnTopLayer|mask=True|apply=True
只操作底层走线的表达式为：expr=IsTrack and OnBottomLayer|mask=True|apply=True
只操作电气走线的表达式为：expr=IsTrack and IsElectrical|mask=True|apply=True
只操作过孔的表达式为： expr=IsVia|mask=True|apply=True
只操作顶层元件的表达式为：expr=IsComponent and OnTopLayer|mask=True|apply=True
