Always minimize empty tags.
Always minimize empty tags. Note that this may be problematic for XHTML, in which
case scala.xml.Xhtml#toXhtml
should be used instead.
Minimize empty tags if they were originally empty when parsed, or if they were constructed
with scala.xml.Elem#minimizeEmpty
== true
Never minimize empty tags.
Governs how empty elements (i.e. those without child elements) should be serialized.