<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31320099</termId><termName>microballoons</termName><termType>PT</termType><termNote><![CDATA[ Hollow microscopic spheres made of glass or ceramic used as filler, especially in bulk for insulation or buoyancy. ]]></termNote><termCreatedDate>2026-03-30 20:26:16</termCreatedDate><relation><relationType>UF</relationType><termId>31320100</termId><termName>glass bulbs</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31320101</termId><termName>glass microspheres</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31320102</termId><termName>microballoon</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31305949</termId><termName>filler</termName><termType>PT</termType></relation></term>  </Zthes>