<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31438291</termId><termName>heartwood</termName><termType>PT</termType><termNote><![CDATA[ Hard, central wood of the trunks of dead trees. Usually, heartwood contains tannins which make it aromatic and dark in color.  ]]></termNote><termCreatedDate>2026-03-30 20:58:08</termCreatedDate><relation><relationType>UF</relationType><termId>31438292</termId><termName>duramen</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31438293</termId><termName>heart-wood</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31411735</termId><termName>wood by form or function</termName><termType>PT</termType></relation></term>  </Zthes>