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mads.xsd"><authority><topic authority="http://roble.intecca.uned.es/tematres/lem/">Estructuras metálicas</topic></authority><related type="narrower"><topic>Puentes metálicos</topic></related><related type="narrower"><topic>Estructuras de acero</topic></related><related type="narrower"><topic>Estructuras de aluminio</topic></related><related type="other"><topic>Carpintería metálica</topic></related><related type="broader"><topic>Construcciones metálicas</topic></related><related type="broader"><topic>Productos metálicos</topic></related><variant type="other"><topic>Construcción metálica</topic></variant></mads>