<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31438463</termId><termName>calcium compounds</termName><termType>PT</termType><termNote><![CDATA[ Compounds containing calcium. ]]></termNote><termCreatedDate>2026-03-30 20:58:11</termCreatedDate><relation><relationType>BT</relationType><termId>31412127</termId><termName>calcium and calcium compounds</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31457258</termId><termName>calcium oxide</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31457260</termId><termName>calcium carbonate</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31457262</termId><termName>calcium phosphate</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31343349</termId><termName>calcium stearate</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31343408</termId><termName>calcium alkoxide</termName><termType>PT</termType></relation></term>  </Zthes>