version 
- specifies the version used in the XML document (1.0)
encoding
- defines the character encoding used in the XML document (UTF-8)
standalone
- if the value is
yes
it means there is no external declaration required to parse the document (yes)
by Valeri Tandilashvili
4 years ago
XML
XML declaration
XML Tutorial
0
Pro tip: use ```triple backticks around text``` to write in code fences