<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31438662</termId><termName>silica sand</termName><termType>PT</termType><termNote><![CDATA[ Sand comprised of silica, which is 98% pure, and used in glassmaking. ]]></termNote><termCreatedDate>2026-03-30 20:58:14</termCreatedDate><relation><relationType>UF</relationType><termId>31438663</termId><termName>sand, silica</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31438664</termId><termName>silica sands</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31412358</termId><termName>glass sand</termName><termType>PT</termType></relation></term>  </Zthes>