<?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">poros</topic></authority><related type="broader"><topic>limestone by composition: aggregate type</topic></related> <note xml:lang="en"><![CDATA[ Variously defined limestones, occurring in Egypt and the Peloponnesus and extensively used as building materials by the ancient Greeks; apparently included several materials, such as tufa, travertine, fossiliferous limestone, and onyx marble. ]]></note></mads>