<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31316697</termId><termName>petroleum</termName><termType>PT</termType><termNote><![CDATA[ Complex mixture of hydrocarbons that occurs naturally beneath the earth's surface, viscous yellow to black in color. Petroleum is refined (i.e.,separated by distillation) into useable fractions. ]]></termNote><termCreatedDate>2026-03-30 20:25:16</termCreatedDate><relation><relationType>BT</relationType><termId>31303867</termId><termName>petroleum and petroleum by product</termName><termType>PT</termType></relation></term>  </Zthes>