<?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">filtration</topic></authority><related type="narrower"><topic>sieving</topic></related><related type="broader"><topic>separating</topic></related><variant type="other"><topic>filtered</topic></variant><variant type="other"><topic>filtering</topic></variant> <note xml:lang="en"><![CDATA[ The process of passing a liquid or other material through a filter or porous medium in order to remove  or separate solid particles or impurities. May also refer to the process of passing an electrical signal or other signal through a filter to remove excess noise or undesired frequencies. ]]></note></mads>