<?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">tube structures</topic></authority><related type="broader"><topic>rigid frames</topic></related><variant type="other"><topic>tube structure</topic></variant><variant type="other"><topic>tube-in-tube construction</topic></variant><variant type="other"><topic>tube-in-tube structures</topic></variant><variant type="other"><topic>construction, tube-in-tube</topic></variant><variant type="other"><topic>structures, tube</topic></variant><variant type="other"><topic>structures, tube in tube</topic></variant><variant type="other"><topic>structures, tube-in-tube</topic></variant><variant type="other"><topic>tube in tube construction</topic></variant><variant type="other"><topic>tube in tube structures</topic></variant> <note xml:lang="en"><![CDATA[ Rigid frame structures with closely spaced exterior columns rigidly connected to spandrel beams to form a tubelike exterior framework that carries all lateral loads, as in the World Trade Center towers, New York City. ]]></note></mads>