<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31353461</termId><termName>oxygen tanks</termName><termType>PT</termType><termNote><![CDATA[ Storage vessels in which oxygen is kept under pressure in a gas cylinder. These are used for a variety of purposes in medical or exploratory contexts such as mountain climbing. ]]></termNote><termCreatedDate>2026-03-30 20:35:23</termCreatedDate><relation><relationType>UF</relationType><termId>31353462</termId><termName>breathing tank</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31353463</termId><termName>oxygen tank</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31324535</termId><termName>medical equipment</termName><termType>PT</termType></relation></term>  </Zthes>