<?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_es">aleación de hierro</topic></authority><related type="narrower"><topic>hierro fundido</topic></related><related type="narrower"><topic>hierro forjado</topic></related><related type="narrower"><topic>acero</topic></related><related type="narrower"><topic>Invar</topic></related><related type="broader"><topic>hierro y aleaciones de hierro</topic></related> <note xml:lang="es"><![CDATA[ Aleación en la cual el hierro es el elemento principal.
 ]]></note></mads>