<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">comets</topic></authority><related type="other"><topic>xihuitl</topic></related><related type="broader"><topic>extraterrestrial bodies</topic></related><related type="broader"><topic>rock by form</topic></related><variant type="other"><topic>comet</topic></variant> <note xml:lang="en"><![CDATA[ An extraterrestrial body consisting of a frozen mass and rock debris that travels around the Sun in a highly elliptical orbit; it generally developes a diffuse gaseous envelope and a long luminous tail when near the Sun. ]]></note></mads>