    link.isElement()

Always returns `false`. The reason the method is here is that both `joint.dia.Element` and `joint.dia.Link` inherit from `joint.dia.Cell`. This method is useful if you don't know what the cell is. Calling `el.Element()` is equivalent to `el instanceof joint.dia.Element`. Example:

    var cell = graph.getCell(myId)
    if (cell.isElement()) {
        // Do something if the cell is an element.
    }