The stylesheet did not consider long, wrapped lines when generating IDs,
and produced broken IDs with linefeeds and multiple dashes. Fix that
with numerous applications of normalize-space() before translating
spaces into dashes. This stylesheet is XSL 1.0. I don't know if there
is a reason for that. If it were XSL 2.0, we could define a single
xsl:function to format IDs and factor out all these normalize-space()
and translate(, ' ','-') functions into it.