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	mads.xsd"><authority><topic authority="http://www.serbi.ula.ve/tematres/vocab/">TUBERIAS</topic></authority><related type="narrower"><topic>CONDUCTOS DE VENTILACION</topic></related><related type="narrower"><topic>INSTALACIONES DE TUBERIAS</topic></related><related type="narrower"><topic>TUBERIA DE HIERRO</topic></related><related type="narrower"><topic>TUBERIAS DE CALOR</topic></related><related type="narrower"><topic>TUBERIAS DE VAPOR</topic></related><related type="narrower"><topic>TUBERIAS PARA AGUA</topic></related></mads>