<?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">active solar heating</topic></authority><related type="broader"><topic>solar heating</topic></related><variant type="other"><topic>active solar heating systems</topic></variant><variant type="other"><topic>active solar systems</topic></variant><variant type="other"><topic>active systems</topic></variant><variant type="other"><topic>heating systems, active solar</topic></variant><variant type="other"><topic>solar heating systems, active</topic></variant><variant type="other"><topic>solar heating, active</topic></variant><variant type="other"><topic>solar systems, active</topic></variant><variant type="other"><topic>systems, active solar</topic></variant><variant type="other"><topic>systems, active solar heating</topic></variant> <note xml:lang="en"><![CDATA[ Solar heating systems that include mechanical equipment and hardware to collect and transport heat; for solar heating systems without mechanical assistance, use "passive solar heating." ]]></note></mads>