opm中,如何设置schema,让阀门、仪表 膨胀节等管件自动读取管线中已经设置好的UNIT等字段呢?下面是大神做的,能否帮忙解读下,或者是否有相关资料共享下呢

this.GetRelatedInstance("SEGMENT_HAS_INSTRUMENT:1:PIPING_NETWORK_SEGMENT").GetRelatedInstance("PIPELINE_HAS_SEGMENT:1:PIPING_NETWORK_SYSTEM").UNIT_NAME & this.GetRelatedInstance("SEGMENT_HAS_INSTRUMENT:1:PIPING_NETWORK_SEGMENT").GetRelatedInstance("PIPELINE_HAS_SEGMENT:1:PIPING_NETWORK_SYSTEM").SYSTEM_NAME & this.DEVICE_TYPE_CODE & System.String.Format("{0:D3}",this.NUMBER*1)

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