<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/schema/zthes-1.0.dtd">  <Zthes><term><termId>4222</termId><termName>MAXIMOS Y MINIMOS</termName><termType>PT</termType><termLanguage>es-ES</termLanguage><termVocabulary>TESAURO DE MATERIAS DE SERBIULA</termVocabulary>	<termStatus>active</termStatus>	<termApproval>approved</termApproval>	<termSortkey>MAXIMOS Y MINIMOS</termSortkey><termCreatedDate>MAXIMOS Y MINIMOS</termCreatedDate><termModifiedDate>2015-02-05 11:25:21</termModifiedDate><relation><relationType>BT</relationType><termId>2445</termId><termName>MATEMATICAS</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>381</termId><termName>CALCULO DE VARIACIONES</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>24028</termId><termName>FUNCIONES MAXIMALES</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>376</termId><termName>OPTIMIZACION MATEMATICA</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>6574</termId><termName>PROBLEMAS DE EXTREMAL ( MATEMATICAS)</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>24726</termId><termName>SUPERFICIES MINIMAS</termName><termType>PT</termType></relation></term>  </Zthes>