function PositionPropertyArray(value, referenceFrame) {
  this._value = undefined;
  this._definitionChanged = new Event();
  this._eventHelper = new EventHelper();
  this._referenceFrame = referenceFrame ?? ReferenceFrame.FIXED;
  this.setValue(value);
}
A {@link Property} whose value is an array whose items are the computed value
of other PositionProperty instances.

@alias PositionPropertyArray
@constructor

@param {Property[]} [value] An array of Property instances.
@param {ReferenceFrame} [referenceFrame=ReferenceFrame.FIXED] The reference frame in which the position is defined.