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	mads.xsd"><authority><topic authority="http://www.serbi.ula.ve/tematres/vocab/">GAS NATURAL</topic></authority><related type="narrower"><topic>CAMPOS PETROLEROS</topic></related><related type="narrower"><topic>GAS LICUADO DE PETROLEO</topic></related><related type="narrower"><topic>GAS NATURAL LICUADO</topic></related><related type="narrower"><topic>PERFORACION</topic></related><related type="broader"><topic>GEOLOGIA ECONOMICA</topic></related><related type="broader"><topic>HIDROCARBUROS</topic></related><related type="broader"><topic>COMBUSTIBLES FOSILES</topic></related><related type="broader"><topic>GASES ASFIXIANTES Y VENENOSOS</topic></related><related type="broader"><topic>INDUSTRIA DEL GAS</topic></related><related type="broader"><topic>POZOS</topic></related></mads>