Decode parses `content` into and returns as map.

DecodeWithoutRoot parses `content` into a map, and returns the map without root level.

Encode encodes map `m` to an XML format content as bytes.

EncodeWithIndent encodes map `m` to an XML format content as bytes with indent.

ToJson converts `content` as XML format into JSON format bytes.

XMLEscapeChars forces escaping invalid characters in attribute and element values.