Nested elements in a QML XmlListModel

AuthorDelegate.qml

import QtQuick 2.0

ListView {
  property int parentIndex

  height: 20

  model: MyXmlListModel{
    query: "/papers/paper["+parentIndex+"]/authors/author"
  }

  delegate: Text{ text:  parentIndex + " - " + author }
}

Main.qml

import QtQuick 2.0
import QtQuick.XmlListModel 2.0

Rectangle {
  width: 300
  height: 400
  
  XmlListModel {
    id: xmlModel
    source: "http://example.com/papers.xml"
    query: "/papers/paper/authors/author"
    XmlRole { name: "author"; query: "@name/string()" }
  }

  ListView {
    anchors.fill: root
    spacing: 20
    model: xmlModel.count
    delegate: AuthorDelegate {
      parentIndex: index
    }
  }
}

papers.xml

<papers>
  <paper id="1">
    <authors>
      <author name="Author 1.1" />
      <author name="Author 1.2" />
    </authors>
  </paper>
  <paper id="2">
    <authors>
      <author name="Author 2.1" />
    </authors>
  </paper>
  <paper id="3">
    <authors>
      <author name="Author 3.1" />
      <author name="Author 3.2" />
    </authors>
  </paper>
</papers>