<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/schema/zthes-1.0.dtd">  <Zthes><term><termId>6992</termId><termName>Curvas</termName><termType>TT</termType><termLanguage>es</termLanguage><termVocabulary>INDICES DE MATERIAS</termVocabulary>	<termStatus>active</termStatus>	<termApproval>approved</termApproval>	<termSortkey>Curvas</termSortkey><termCreatedDate>Curvas</termCreatedDate><relation><relationType>RT</relationType><termId>3924</termId><termName>Matemáticas</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>4769</termId><termName>Geometría</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>6943</termId><termName>Geometría analítica</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>6947</termId><termName>Geometría diferencial</termName><termType>PT</termType></relation></term>  </Zthes>