<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31436666</termId><termName>rock salt</termName><termType>PT</termType><termNote><![CDATA[ Sodium chloride that occurs naturally as, or obtained mechanically from, a mineral deposit and sold as large crystals. Rock salt is used to melt ice, as a food preservative, and for the production of soda ash by the glass industry. To refer to the mineral composed of sodium chloride, use "halite." ]]></termNote><termCreatedDate>2026-03-30 20:57:44</termCreatedDate><relation><relationType>UF</relationType><termId>31436667</termId><termName>salt, rock</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31410815</termId><termName>sodium chloride by form</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31344649</termId><termName>halite</termName><termType>PT</termType></relation></term>  </Zthes>