title: How do I reference id's of children within a canvas in Kivy?
body: <p>I get the error <code>Invalid data after declaration</code> when I try to assign an id to canvas, but I don't see any other way of referencing the id's further below (for example e1). How do I reference e1 in my Python code?</p>
  
  <pre><code>&lt;MyClockWidget&gt;:
      face: face
      ticks: ticks
      el1: el1
      FloatLayout:
          id: face
          size_hint: None, None
          pos_hint: {"center_x":0.5, "center_y":0.5}
          size: 0.9*min(root.size), 0.9*min(root.size)
          canvas:
              id: cand
              Color:
                  rgb: 0.5, 0.5, 0.5
              Ellipse:
                  size: self.size     
                  pos: self.pos
          canvas:
              Color:
                  rgb: 0.1, 0.1, 0.1
              Ellipse:
                  id: el1
                  size: self.size     
                  pos: self.pos
                  angle_start: 0
                  angle_end: 90
              Ellipse:
                  id: el2
                  size: self.size     
                  pos: self.pos
                  angle_start: 110
                  angle_end: 130
  </code></pre>