The subordinate name of a journal component such as an article
In the article metadata, the article subtitle and title are two different elements and should be tagged separately, using the <article-title> and <subtitle> elements.
Within a bibliographic reference citation, the subtitle cannot be preserved separately. For citations using <citation>, it is possible to place the subtitle with the title in the <article-title> element (or the <source> element for book titles, proceedings titles, and other titles) or to leave it as untagged data characters within the text of the reference. For references using <nlm-citation>, the subtitle must be included with the title, since that reference model does not permit untagged text. Although this tag set cannot enforce either practice when using <citation>, retrieval performance will be enhanced if the subtitle is consistently placed in the <article-title> element (or the <source> element for book titles, proceedings titles, and other titles) for all cited material, so this is considered best practice.
<!ELEMENT subtitle (#PCDATA %title-elements;)* >
Any combination of:
<title-group> Title Group; <verse-group> Verse Form for Poetry
<article>
<front>
<article-meta>
<title-group>
<article-title>Adaptins<fn id="FN206">
<p>Online version of this essay contains
supplemental tabular material.</p>
</fn>
</article-title>
<subtitle>The Final Recount</subtitle>
</title-group>
...
</article-meta>
</front>
...
</article>
articlemeta.ent