GraphsTheme documentation ambiguities

import QtQuick
import QtGraphs

Window {
  id: root
  width: 1280
  height: 960
  visible: true
  title: qsTr("Graphs 3D - Bar Graph")

  Bars3D {
    id: barGraph
    anchors.fill: parent

    theme: GraphsTheme {
      theme: GraphsTheme.Theme.UserDefined
      baseColors: ["red"]
    }

    Bar3DSeries {
      id: barSeries

      ItemModelBarDataProxy {
        itemModel: dataModel
        columnRole: "xPos"
        rowRole: "zPos"
        valueRole: "yPos"
      }
    }
  }

  ListModel {
    id: dataModel
    Component.onCompleted: {
      for (let i = -10; i <= 10; ++i) {
        for (let j = -10; j <= 10; ++j) {
          dataModel.append({"xPos": i, "yPos": (i + j), "zPos": j})
        }
      }
    }
  }
}