The output property
standalone="omit" is now recognized. It is equivalent to omitting the property
(but is useful if you need to override a value set elsewhere).
omit-xml-declaration="yes" is now respected regardless of the encoding,
even if this causes the result to be ill-formed XML. This conforms with a change in the specification, made
because there is sometimes a need to create fragments of XML that are subsequently concatenated or edited.