 only apply to stream results, they have no effect when
the result is a DOM tree or SAX event stream.</p>

<p>Strings that match the <a href="http://www.w3.org/TR/xslt#output">XSLT
specification for xsl:output attributes</a> can be referenced from the
{@link javax.xml.transform.OutputKeys} class. Other strings can be
specified as well.
If the transformer does not recognize an output key, a
{@link java.lang.IllegalArgumentException} is thrown, unless the
key name is <a href="#qname-delimiter">namespace quali