title: Does vega only support to create chart, not diagram?
body: <p>I found that most of the examples of vega are illustrating creating charts which are with the x-axis, y-axis, title, and legends. There is even <code>axis</code> and <code>scales</code> defined in the specs. My question is:</p>
  
  <p><strong>Does <em>vega</em> support to create diagrams? such as UML editor?</strong></p>