<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31347143</termId><termName>solar water heaters</termName><termType>PT</termType><termNote><![CDATA[ Water heaters whose primary source of heat energy is the sun. ]]></termNote><termCreatedDate>2026-03-30 20:33:39</termCreatedDate><relation><relationType>UF</relationType><termId>31347144</termId><termName>heaters, solar water</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31347145</termId><termName>solar water heater</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31347146</termId><termName>water heaters, solar</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31322064</termId><termName>water heaters</termName><termType>PT</termType></relation></term>  </Zthes>