<?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">caves</topic></authority><related type="narrower"><topic>natural tunnels</topic></related><related type="other"><topic>cave architecture</topic></related><related type="other"><topic>cave paintings</topic></related><related type="other"><topic>burial caves</topic></related><related type="other"><topic>cave churches</topic></related><related type="other"><topic>cave temples</topic></related><related type="other"><topic>cave dwellings</topic></related><related type="broader"><topic>landforms</topic></related><variant type="other"><topic>cave</topic></variant> <note xml:lang="en"><![CDATA[ Natural openings in the earth large enough for human exploration, the largest and most common being those formed by a chemical reaction between circulating groundwater and limestone or dolomite bedrock.  ]]></note></mads>