<?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">lines</topic></authority><related type="narrower"><topic>plimsoll lines</topic></related><related type="narrower"><topic>isotherms</topic></related><related type="broader"><topic>geometric concepts</topic></related><variant type="other"><topic>line</topic></variant> <note xml:lang="en"><![CDATA[ In mathematics, the trace of a moving point in continuous extent, either straight or curved, having length but without breadth or thickness. In geometry, the concept of a line can vary with the definition of geometry; for example in analytic geometry, a line is the set of points on a plane having coordinates that satisfy a given linear equation; in incidence geometry, a line may be an independent object distinct from the set of points which lie on it. ]]></note></mads>