<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31449657</termId><termName>gliders</termName><termType>PT</termType><termNote><![CDATA[ Motorless heavier than air aircraft using air currents to soar from lower to higher altitudes and gravity to descend. ]]></termNote><termCreatedDate>2026-03-30 21:01:04</termCreatedDate><relation><relationType>UF</relationType><termId>31449658</termId><termName>glider</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31426098</termId><termName>fixed-wing aircraft</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31465625</termId><termName>sailplanes</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31426190</termId><termName>hang gliders</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31465627</termId><termName>paragliders</termName><termType>PT</termType></relation></term>  </Zthes>