void () { myFixture.configureByText("a.xml", """ <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:x2="http://www.w3.org/2001/XMLSchema" <warning descr="Namespace declaration is never used">xmlns:x3="http://www.w3.org/2001/XMLSchema"</warning> > <xs:element name="a" type="x2:string"/> </xs:schema>"""); myFixture.testHighlighting(); }