A recent sourceforge ticket notes that
In the "Rhyme" section of the Guidlines chapter on verse (VE-Verse.xml#VERH):
<p>Non-rhyming lines within such a group may be represented using a
hyphen or an x, as in the following example:
<!-- example needed -->
Obviously, an example is needed.
Can anyone suggest a suitable example? Must be short, taken from a real text,
and accompanied by a bibliographic citation.