Atom and Base

In XMIR, atom object can not have @base attribute.

Incorrect:

<program>
  <objects>
    <o name="obj" base="bar">
      <o name="λ"/>
    </o>
  </objects>
</program>

Correct:

<program>
  <objects>
    <o name="obj">
      <o name="λ"/>
    </o>
  </objects>
</program>

or:

<program>
  <objects>
    <o name="obj" base="bar">
      <o name="foo"/>
    </o>
  </objects>
</program>