Object Line Out Of Listing

Line number inside <o/> in XMIR cannot be bigger than amount of lines in the listing.

Incorrect:

<program>
  <listing>first line
    second line
    third line</listing>
  <objects>
    <o line="500" atom="foo"/>
  </objects>
</program>

Correct:

<program>
  <listing>first line
    second line
    third line</listing>
  <objects>
    <o line="2" atom="foo"/>
  </objects>
</program>