In Lab 4A, you get an undesired space
for authors without middle names, and an undesired comma
for books without year of publication, e.g.:
Neruda, Pablo . Twenty Love Poems and a Song of Despair.
London: Jonathan Cape, .
To avoid this, use text templates for the middle
and year elements.
Edit lab4b.xsl.
Add a text template for year
(middle is already provided for you).
Note the usage of the <xsl:text> element.
This element is used to output text while preserving white space.
Therefore, the line
