<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31398562</termId><termName>densitometers</termName><termType>PT</termType><termNote><![CDATA[ Instruments that measure optical density of materials or objects by measuring the intensity of transmitted or reflected light; used, for example, in photography to measure the opacity of images or to determine film speed. ]]></termNote><termCreatedDate>2026-03-30 20:47:09</termCreatedDate><relation><relationType>UF</relationType><termId>31398563</termId><termName>densitometer</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31358530</termId><termName>light absorption measuring devices</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31428297</termId><termName>photographic densitometers</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31317206</termId><termName>densitometry</termName><termType>PT</termType></relation></term>  </Zthes>