Converting Map objects in List to XML

ListingMap2xml.scala

package personal.ayaeiya.scala.sample

import scala.xml._

case class ListEndDummy{}
case class MapEndDummy{}

object Main{
  def main(args:Array[String]) = {
    def toXml(list:List[Any]):Elem = {
      val lst = list ::: List(ListEndDummy)
      XML.loadString(lst.foldLeft("<list>"){ (s,m) => 
        s + (m match {
          case map:Map[String,Any] => toNode(map)
          case ListEndDummy => "</list>"
        })
      })
    }
    def toNode(map:Map[String,Any]):String = {
      // Hold sort & Add dummy
      val m = map.toList ::: List(("dmy",MapEndDummy))
      m.foldLeft(("xml","<map>")){
        (st1,st2) =>
        ("xml",
          st1._2 +
          (st2._2 match {
            case v:String          => "<" + st2._1+">" + v + "</"+st2._1+">"
            case MapEndDummy       => "</map>"
            case v:Map[String,Any] => "<" + st2._1+">" + toNode(v) + "</"+st2._1+">"
            case _=> "<other />"
          })
        )
      }._2
    }

    val mp = List(
      Map("Key0"->"Value0"),
      Map("Key1"->"Value1","Key1-2"->"Value1-2"),
      Map("Key2"->Map("Key2-1"->"Value2-1","Key2-2"->"Value2-2"),
          "Key3"->Map("Key3-1"->"Value3-1","Key3-2"->"Value3-2"))
    )
    println(toXml(mp))
  }
}