Finished marking up the second article, and also had to make some revisions to XSLT and CSS to handle some new issues thrown up by it:

• Templates for <ref> elements can now handle linking between articles in the editorial collection, and handling of <ref> elements generally is slightly more robust.
• Blockquotes are now correctly handled in the context of articles, including better margins when verse stanzas or lines are quoted.
• Popups (for notes, biblio refs etc.) now no longer have a min-height. I can't see why I gave them one originally, but it led to lots of empty space in the popup if the content was short.