<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31343262</termId><termName>magnesium oxide</termName><termType>PT</termType><termNote><![CDATA[ Oxide of magnesium, a highly refractive, white, powdery material used in ceramic glazes, bricks, magnesia cement, and other industrial processes. In paper conservation, magnesium oxide has been used as a nonaqueous alkalization agent. ]]></termNote><termCreatedDate>2026-03-30 20:32:35</termCreatedDate><relation><relationType>UF</relationType><termId>31343263</termId><termName>MgO</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343264</termId><termName>magnesia</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343265</termId><termName>oxide, magnesium</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31319736</termId><termName>compounds</termName><termType>PT</termType></relation></term>  </Zthes>