<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31301454</termId><termName>porosity</termName><termType>PT</termType><termNote><![CDATA[ The ratio of the volume of the interstices of a material to the volume of its mass. ]]></termNote><termCreatedDate>2026-03-30 20:21:00</termCreatedDate><relation><relationType>UF</relationType><termId>31301455</termId><termName>porous</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31298159</termId><termName>physical properties</termName><termType>PT</termType></relation></term>  </Zthes>