<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31316668</termId><termName>betulin</termName><termType>PT</termType><termNote><![CDATA[ A resin extracted from birch bark. It has been identified as a component of archaeological tars found in  Austrian sites, demonstrating that the Iron Age tars were made from birch. ]]></termNote><termCreatedDate>2026-03-30 20:25:16</termCreatedDate><relation><relationType>BT</relationType><termId>31303857</termId><termName>resin</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31454693</termId><termName>Betula</termName><termType>PT</termType></relation></term>  </Zthes>