<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31440104</termId><termName>pneumatic structures</termName><termType>PT</termType><termNote><![CDATA[ Membrane structures that attain stability by internal pressurization, usually by air. ]]></termNote><termCreatedDate>2026-03-30 20:58:38</termCreatedDate><relation><relationType>UF</relationType><termId>31440107</termId><termName>pneumatic structure</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31440108</termId><termName>structures, balloon</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31440109</termId><termName>structures, pneumatic</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31440105</termId><termName>balloon structures</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31440106</termId><termName>pneumatic buildings</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31414652</termId><termName>membrane structures</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31458651</termId><termName>air-inflated structures</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31458656</termId><termName>air-supported structures</termName><termType>PT</termType></relation></term>  </Zthes>