整个场地中挂在的RFID读取机可以测定与特定标签的角度和距离，并将每个表演者对应定位到舞台的某个虚拟网格空间中。
RFID readers mounted throughout the venue can determine the angle and distance from a specific tag and map individual performers to a virtual grid of spaces on the stage.
接下来，客户机读取调用的服务所需的输入参数。
Next the client reads the input parameters required by the service being invoked.
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