<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31343328</termId><termName>phosphonate</termName><termType>PT</termType><termNote><![CDATA[ Any salt or ester of a phosphonic acid. Phosphonates have been tested in recent years as potential crystallization inhibitors for sodium sulfate, a soluble salt that damages historic buildings and sculptures. ]]></termNote><termCreatedDate>2026-03-30 20:32:36</termCreatedDate><relation><relationType>UF</relationType><termId>31343329</termId><termName>phosphonates</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31319736</termId><termName>compounds</termName><termType>PT</termType></relation></term>  </Zthes>