{"tutorial": {"title": "Invisible Markup"; "speaker": "Steven Pemberton"}}
<tutorial title="Invisible Markup" speaker= "Steven Pemberton"/>
<tutorial> <title>Invisible Markup</title> <speaker>Steven Pemberton</speaker> </title>
or indeed
Tutorial title: Invisible Markup speaker: Steven Pemberton
30 April 2023
<date> <day>30</day> <month>April</month> <year>2023</year> </date>
[spec] Steven Pemberton (ed.), Invisible XML Specification, invisiblexml.org, 2022, https://invisiblexml.org/ixmlspecification.html
<biblioentry abbrev='spec'> <editor> <firstname>Steven</firstname> <surname>Pemberton</surname> </editor> <title>Invisible XML Specification</title> <publisher>invisiblexml.org</publisher> <pubdate>2022</pubdate> <link href='https://invisiblexml.org/ixml-specification.html'/> </biblioentry>