<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/schema/zthes-1.0.dtd">  <Zthes><term><termId>48902</termId><termName>SISTEMAS HAMILTONIANOS</termName><termType>PT</termType><termLanguage>es-ES</termLanguage><termVocabulary>TESAURO DE MATERIAS DE SERBIULA</termVocabulary>	<termStatus>active</termStatus>	<termApproval>approved</termApproval>	<termSortkey>SISTEMAS HAMILTONIANOS</termSortkey><termCreatedDate>SISTEMAS HAMILTONIANOS</termCreatedDate><termModifiedDate>2015-02-20 11:33:13</termModifiedDate><relation><relationType>BT</relationType><termId>6558</termId><termName>SISTEMAS DINAMICOS DIFERENCIALES</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>6572</termId><termName>ECUACIONES HAMILTON-JACOBI</termName><termType>PT</termType></relation></term>  </Zthes>