OptionalencodingEncoding in the XML Declaration, or undefined when unspecified. The
encoding label is converted to lower case to be consistent with the
encoding property of TextDecoder, and ensures encoding labels are
processed in a case-insensitive way.
The parser does not validate that the encoding label is one of the officially assigned IANA Character Sets nor does it resolve aliases.
OptionalstandaloneStandalone value declared in the XML Declaration.
true when set to yes, false when set to no, or undefined when
unspecified.
Version declared in the XML Declaration. Generally 1.0 or 1.1.
XML declaration (XMLDecl).