<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31344462</termId><termName>corundum</termName><termType>PT</termType><termNote><![CDATA[ A very hard crystalline mineral made of aluminum oxide, used chiefly as an abrasive. ]]></termNote><termCreatedDate>2026-03-30 20:32:54</termCreatedDate><relation><relationType>BT</relationType><termId>31320469</termId><termName>mineral</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31376754</termId><termName>gemstones by specific type</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31375322</termId><termName>emery</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31375323</termId><termName>ruby</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31375325</termId><termName>sapphire</termName><termType>PT</termType></relation></term>  </Zthes>