<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/schema/zthes-1.0.dtd">  <Zthes><term><termId>21334</termId><termName>SISTEMAS BIOLOGICOS</termName><termType>PT</termType><termLanguage>es-ES</termLanguage><termVocabulary>TESAURO DE MATERIAS DE SERBIULA</termVocabulary>	<termStatus>active</termStatus>	<termApproval>approved</termApproval>	<termSortkey>SISTEMAS BIOLOGICOS</termSortkey><termCreatedDate>SISTEMAS BIOLOGICOS</termCreatedDate><relation><relationType>UF</relationType><termId>21336</termId><termName>Biosistemas</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>21335</termId><termName>FILOSOFIA DE LA BIOLOGIA</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>359</termId><termName>TEORIA DE SISTEMAS</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>3973</termId><termName>SISTEMAS DE CONTROL BIOLOGICO</termName><termType>PT</termType></relation></term>  </Zthes>