<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31343563</termId><termName>calcium</termName><termType>PT</termType><termNote><![CDATA[ A silvery white metal, with symbol Ca and atomic number 20, the fifth most abundant element in the earth's crust, occurring in many compounds. Its uses include as a nutritional supplement to assist the growth of bone and teeth, as a dehydrating agent for organic solvents, and to remove gases from molten metals prior to casting. ]]></termNote><termCreatedDate>2026-03-30 20:32:39</termCreatedDate><relation><relationType>UF</relationType><termId>31343564</termId><termName>Ca</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31412127</termId><termName>calcium and calcium compounds</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31375243</termId><termName>nonferrous metal</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31319740</termId><termName>elements</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31344635</termId><termName>calcium propionate</termName><termType>PT</termType></relation></term>  </Zthes>