import Foundation

let xml = """
<?xml version="1.0" encoding="UTF-8"?>
<root></root>
"""

open class Delegate: NSObject, XMLParserDelegate {
  public func parse(data:Data) {
    let xmlParser = XMLParser(data:data)
    xmlParser.delegate = self
    print(xmlParser.parse())
  }
  
  public func parserDidStartDocument(_ parser: XMLParser) {
    parser.abortParsing()
  }
}

Delegate().parse(data:xml.data(using:.utf8)!)