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	mads.xsd"><authority><topic authority="http://www.serbi.ula.ve/tematres/vocab/">CALEFACCION</topic></authority><related type="narrower"><topic>AISLADORES TERMICOS</topic></related><related type="narrower"><topic>CALEFACCION ELECTRICA</topic></related><related type="narrower"><topic>CHIMENEAS</topic></related><related type="narrower"><topic>CHIMENEAS FRANCESAS</topic></related><related type="narrower"><topic>HORNOS</topic></related><related type="narrower"><topic>QUEMADORES DE PETROLEO</topic></related><related type="narrower"><topic>VENTILADORES (MAQUINARIA)</topic></related><related type="other"><topic>CALDERAS</topic></related><related type="other"><topic>VENTILACION</topic></related><related type="broader"><topic>COMBUSTIBLE</topic></related><related type="broader"><topic>ECONOMIA DOMESTICA</topic></related><related type="broader"><topic>INGENIERIA AMBIENTAL (EDIFICIOS)</topic></related><variant type="other"><topic>Construcción--Calefacción y ventilación</topic></variant></mads>