<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31341538</termId><termName>sulfation</termName><termType>PT</termType><termNote><![CDATA[ Refers to the creation of salts or esters of sulfuric acid that occurs when sulfate ions are incorporated into molecules. In a conservation science context sulfation most often refers to chemical weathering of stone by airborne pollution. ]]></termNote><termCreatedDate>2026-03-30 20:32:06</termCreatedDate><relation><relationType>UF</relationType><termId>31341539</termId><termName>sulfating</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31341540</termId><termName>sulphation</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31317766</termId><termName>weathering</termName><termType>PT</termType></relation></term>  </Zthes>