Function to_string_with_declaration 

pub fn to_string_with_declaration<T: Serialize>(
    value: &T,
) -> Result<String, ParseError>

Serialize an ISO 20022 message type to an XML string with an XML declaration.

Prepends <?xml version="1.0" encoding="UTF-8"?> before the XML body.

Errors

Returns ParseError::Serialize if the value cannot be serialized.