<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31328656</termId><termName>Gregorian calendar</termName><termType>PT</termType><termNote><![CDATA[ The internationally most widely used civil calendar, named for Pope Gregory XIII, who introduced it in October 1582. It is typically used as a proleptic calendar, which means the dates are extended backward to dates preceding its official introduction in 1582. The Gregorian calendar was a refinement to the Julian calendar, correcting the length of the year by 0.002% through alteration of leap years. ]]></termNote><termCreatedDate>2026-03-30 20:28:35</termCreatedDate><relation><relationType>UF</relationType><termId>31328657</termId><termName>calendar, Gregorian</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31309699</termId><termName>dating systems by specific type</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31362343</termId><termName>[months for Gregorian and Julian calendars]</termName><termType>PT</termType></relation></term>  </Zthes>