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mads.xsd"><authority><topic authority="http://roble.intecca.uned.es/tematres/lem/">Sistemas de transmisión de datos</topic></authority><related type="narrower"><topic>Correo electrónico</topic></related><related type="narrower"><topic>Fax</topic></related><related type="narrower"><topic>Intercambio electrónico de datos</topic></related><related type="narrower"><topic>Sistemas de conmutación (Telecomunicaciones)</topic></related><related type="narrower"><topic>Teletexto</topic></related><related type="narrower"><topic>Télex</topic></related><related type="narrower"><topic>Videotexto</topic></related><related type="other"><topic>Multiplexores</topic></related><related type="other"><topic>Modems</topic></related><related type="other"><topic>Bibliotecas-Automatización</topic></related><related type="other"><topic>Sistemas de adquisición de datos</topic></related><related type="other"><topic>Bases de datos</topic></related><related type="other"><topic>Redes digitales de servicios integrados</topic></related><related type="other"><topic>Redes de bibliotecas</topic></related></mads>