<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31343503</termId><termName>cesium</termName><termType>PT</termType><termNote><![CDATA[ Metallic element having symbol Cs and atomic number of 132.905. Cesium is a soft, silvery gold alkali metal with a very low melting point; it is the most reactive and electropositive of all the elements. ]]></termNote><termCreatedDate>2026-03-30 20:32:38</termCreatedDate><relation><relationType>UF</relationType><termId>31343504</termId><termName>Cs</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343505</termId><termName>caesium</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31319740</termId><termName>elements</termName><termType>PT</termType></relation></term>  </Zthes>