<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31375285</termId><termName>base metal</termName><termType>PT</termType><termNote><![CDATA[ Metal or alloy that is not resistant to oxidation and corrosion in moist air; base metals are thus distinguished from "noble metal." Base metals are also usually of minimum monetary value, and are thus commonly distinguished from "precious metal" as well. ]]></termNote><termCreatedDate>2026-03-30 20:41:12</termCreatedDate><relation><relationType>UF</relationType><termId>31375286</termId><termName>base metals</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31375287</termId><termName>metal, base</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31344452</termId><termName>metal by quality</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31375282</termId><termName>precious metal</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31375288</termId><termName>noble metal</termName><termType>PT</termType></relation></term>  </Zthes>