XML Version

The default is 1.0. You may need to change this value for
a future version of XML

Encoding

The encoding declaration specifies the character-set encoding used
in the document, such as UTF-16 or ISO-10646-UCS-4. If there is
no encoding declaration, the document should use UTF-8 encoding.

Standalone

The standalone document declaration specifies whether the document
contains no external markup that needs to be processed and can therefore
stand alone (Yes), or that there are, or might be, external markup declarations
in the document (No). The value in the default template is No, and if
there is no standalone document declaration, the value is assumed
to be No.