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mads.xsd"><authority><topic authority="http://roble.intecca.uned.es/tematres/lem/">Metales</topic></authority><related type="narrower"><topic>Aleaciones</topic></related><related type="narrower"><topic>Metales de transición</topic></related><related type="narrower"><topic>Metales preciosos</topic></related><related type="narrower"><topic>Tierras raras</topic></related><related type="other"><topic>Metalurgia</topic></related><related type="other"><topic>Alquimia</topic></related><related type="other"><topic>Química inorgánica</topic></related><related type="other"><topic>Metalografía</topic></related><related type="other"><topic>Radio (Metal)</topic></related><related type="other"><topic>Recubrimientos metálicos</topic></related><related type="other"><topic>Chapas metálicas</topic></related><related type="broader"><topic>Elementos químicos</topic></related></mads>