<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31327469</termId><termName>vacuum</termName><termType>PT</termType><termNote><![CDATA[ A given space filled with a gas at pressure below atmospheric pressure. ]]></termNote><termCreatedDate>2026-03-30 20:28:15</termCreatedDate><relation><relationType>BT</relationType><termId>31308499</termId><termName>pressure</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31351193</termId><termName>vacuum chambers</termName><termType>PT</termType></relation></term>  </Zthes>