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                 PTREF - reference to a 3D Pointset element.  
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                 GMREF - reference to a 3D Geomset element. 
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                 PARAM - the component parameters, a list of values used in the 3D Pointset and 3D Geomset to define the Component. 
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                 GTYPE - a word attribute indicating the generic type of the Piping Component, selected from the following: 
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                 DTREF - reference to a Dataset element.  
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