<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">W3C (2017):</hi> <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">HTML 5.2 Recommendation (14 December 2017):</hi> §9: XML Syntax. <ref xmlns="http://www.tei-c.org/ns/1.0" target="https://www.w3.org/TR/html52/xhtml.html#xhtml"> <hi rend="underline color(1155CC)">https://www.w3.org/TR/html52/xhtml.html#xhtml</hi> </ref>