<?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">hollow masonry units</topic></authority><related type="broader"><topic>masonry units</topic></related><variant type="other"><topic>masonry units, hollow</topic></variant><variant type="other"><topic>units, hollow masonry</topic></variant><variant type="other"><topic>block, hollow</topic></variant><variant type="other"><topic>hollow block</topic></variant> <note xml:lang="en"><![CDATA[ Masonry units whose net corss-sectioned area in any plane parallel to the bearing surface is less than 75% of its gross cross-sectional area measured in the same plane. ]]></note></mads>