<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31436395</termId><termName>polylactic acid</termName><termType>PT</termType><termNote><![CDATA[ Thermoplastic polyester manufactured from corn starch or other renewable resources. First developed for use as a synthetic fiber during World War 2 when organic materials were in short supply. In conservation used as a protective covering for stone materials exposed outdoors.  ]]></termNote><termCreatedDate>2026-03-30 20:57:40</termCreatedDate><relation><relationType>UF</relationType><termId>31436396</termId><termName>PLA</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31436397</termId><termName>acid, polylactic</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31436398</termId><termName>polylactic acid</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31409886</termId><termName>thermoplastic polyester</termName><termType>PT</termType></relation></term>  </Zthes>