<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31316669</termId><termName>ion-exchange resin</termName><termType>PT</termType><termNote><![CDATA[ Any of the range of synthetically polymerized organic compounds suitable for use in ion exchange.  ]]></termNote><termCreatedDate>2026-03-30 20:25:16</termCreatedDate><relation><relationType>UF</relationType><termId>31316670</termId><termName>ion exchange resin</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31316671</termId><termName>ion-exchange resins</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31316672</termId><termName>resin, ion-exchange</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31303857</termId><termName>resin</termName><termType>PT</termType></relation></term>  </Zthes>