<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31320531</termId><termName>xenon</termName><termType>PT</termType><termNote><![CDATA[ A heavy inert noble gas with symbol Xe or X and atomic number of 54, used principally in lamps, lasers, and as a general anaesthetic. ]]></termNote><termCreatedDate>2026-03-30 20:26:23</termCreatedDate><relation><relationType>UF</relationType><termId>31320532</termId><termName>X</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31320533</termId><termName>Xe</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31306143</termId><termName>inorganic material</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31319740</termId><termName>elements</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31459572</termId><termName>xenon lamps</termName><termType>PT</termType></relation></term>  </Zthes>