<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31328508</termId><termName>eighteenth century BCE</termName><termType>PT</termType><termNote><![CDATA[ Century in the proleptic Gregorian calendar including the years 1799 to 1700 (or 1800 to 1701) Before Common Era. ]]></termNote><termCreatedDate>2026-03-30 20:28:33</termCreatedDate><relation><relationType>UF</relationType><termId>31328509</termId><termName>18th century B.C.</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31328510</termId><termName>18th century BCE</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31328511</termId><termName>18th-century BCE</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31328512</termId><termName>century, eighteenth, BCE</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31309694</termId><termName>dates by century or millennium</termName><termType>PT</termType></relation></term>  </Zthes>