<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/schema/zthes-1.0.dtd">  <Zthes><term><termId>4772</termId><termName>Teoría electromagnética</termName><termType>PT</termType><termLanguage>es</termLanguage><termVocabulary>INDICES DE MATERIAS</termVocabulary>	<termStatus>active</termStatus>	<termApproval>approved</termApproval>	<termSortkey>Teoría electromagnética</termSortkey><termNote label="Source"><![CDATA[ 535.13 ]]></termNote><termCreatedDate>Teoría electromagnética</termCreatedDate><relation><relationType>UF</relationType><termId>4776</termId><termName>Luz, Teoría electromagnética de la</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>4777</termId><termName>Maxwell, Teorías de</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>4770</termId><termName>Área 2. Óptica física</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>4771</termId><termName>Óptica física</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>4778</termId><termName>Campos, Teoría de los (Física)</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>4779</termId><termName>Electrones</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>138</termId><termName>Luz</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>4780</termId><termName>Maxwell, Ecuaciones de</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>4781</termId><termName>Ondas eléctricas</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>4782</termId><termName>Ondas electromagnéticas</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>4783</termId><termName>Magnetismo</termName><termType>PT</termType></relation></term>  </Zthes>