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	mads.xsd"><authority><topic authority="http://www.serbi.ula.ve/tematres/vocab/">HIDROCARBUROS</topic></authority><related type="narrower"><topic>ACEITES MINERALES</topic></related><related type="narrower"><topic>ALCANOS</topic></related><related type="narrower"><topic>ALQUENOS</topic></related><related type="narrower"><topic>ALQUILACION</topic></related><related type="narrower"><topic>BETUN</topic></related><related type="narrower"><topic>CAROTENOIDES (BIOQUIMICA)</topic></related><related type="narrower"><topic>CRAQUEO</topic></related><related type="narrower"><topic>GAS NATURAL</topic></related><related type="narrower"><topic>PETROLEO SINTETICO</topic></related><related type="narrower"><topic>PETROQUIMICOS</topic></related><related type="narrower"><topic>PRODUCTOS DEL PETROLEO</topic></related><related type="narrower"><topic>TERPENOS</topic></related><related type="other"><topic>INDUSTRIAS PETROQUIMICAS</topic></related><related type="broader"><topic>COMPUESTOS ORGANICOS</topic></related></mads>