<?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://roble.intecca.uned.es/tematres/lem/">Agua</topic></authority><related type="narrower"><topic>Agua destilada</topic></related><related type="narrower"><topic>Agua potable</topic></related><related type="narrower"><topic>Aguas marinas</topic></related><related type="narrower"><topic>Aguas minerales</topic></related><related type="narrower"><topic>Aguas para riego</topic></related><related type="narrower"><topic>Aguas residuales</topic></related><related type="narrower"><topic>Aguas subterráneas</topic></related><related type="narrower"><topic>Precipitaciones atmosféricas</topic></related><related type="narrower"><topic>Aguas superficiales</topic></related><related type="narrower"><topic>Evaporación</topic></related><related type="other"><topic>Recursos hidráulicos</topic></related><related type="other"><topic>Hidrología</topic></related><related type="other"><topic>Energía hidráulica</topic></related><related type="other"><topic>Ingeniería hidráulica</topic></related><related type="other"><topic>Medio ambiente</topic></related><variant type="other"><topic>Aguas</topic></variant></mads>