<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31471228</termId><termName>elvan</termName><termType>PT</termType><termNote><![CDATA[ A type of quartz porphyry, local to Cornwall, England, which is usually light gray in color with a hint of buff; often used for ashlar because of its fine texture. ]]></termNote><termCreatedDate>2026-03-30 21:06:49</termCreatedDate><relation><relationType>BT</relationType><termId>31457322</termId><termName>quartz porphyry</termName><termType>PT</termType></relation></term>  </Zthes>