<?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">rare earth elements</topic></authority><related type="narrower"><topic>yttrium</topic></related><related type="narrower"><topic>scandium</topic></related><related type="broader"><topic>elements</topic></related><variant type="other"><topic>REE</topic></variant><variant type="other"><topic>elements, rare earth</topic></variant><variant type="other"><topic>metals, rare earth</topic></variant><variant type="other"><topic>rare earth element</topic></variant><variant type="other"><topic>rare earth metal</topic></variant><variant type="other"><topic>rare earth metals</topic></variant><variant type="other"><topic>rare-earth element</topic></variant><variant type="other"><topic>rare-earth elements</topic></variant><variant type="other"><topic>rare-earth metal</topic></variant><variant type="other"><topic>rare-earth metals</topic></variant> <note xml:lang="en"><![CDATA[ Any of the group of metallic elements whose oxides are classed as rare earths. These include the lanthanide series, yttrium and scandium.   ]]></note></mads>