<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31484969</termId><termName>porosity</termName><termType>PT</termType><termNote><![CDATA[ A common type of casting flaw that includes a group or area of cavities caused by shrinkage or trapped gases. Porosity may vary considerably in dimension and may or may not break through thesurface of the cast object. ]]></termNote><termCreatedDate>2026-03-30 20:21:11</termCreatedDate><relation><relationType>BT</relationType><termId>31298281</termId><termName>conditions and effects for metals</termName><termType>PT</termType></relation></term>  </Zthes>