<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31344021</termId><termName>superconductor</termName><termType>PT</termType><termNote><![CDATA[ Material having a complete lack of measurable electrical resistance at very low temperatures. ]]></termNote><termCreatedDate>2026-03-30 20:32:46</termCreatedDate><relation><relationType>UF</relationType><termId>31344022</termId><termName>material, superconductor</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31344023</termId><termName>superconductor material</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31320026</termId><termName>electric conductor</termName><termType>PT</termType></relation></term>  </Zthes>