title: how to declare an array in xtext
body: <p>I need to declare an integer array in a domain specific language using xtext.</p>
  
  <pre><code>PolyLine:
  'polyline' color = Color '{'                    Line1
  'points number' n = INT                         Line2
  'x points'                                      Line3
  'y ponts'                                       Line4
  '}';
  </code></pre>
  
  <p>In above rule declaration, I need to get several x and y points which indicate some coordination (theirs number is equal to n property in line2). But I can't find any document that help me to answer my question "How I can declare a array in xtext"?
  Can somebody help please?</p>