As requested in ticket #124, variable interpolation in XML comments has 
been implented in version 0.9 or so. However, ticket #149 shows that 
this can be problematic if you comment out a section like this:

<!--
      <select size="1" name="item" >
      <option py:for="x in mylist" value="$x">$x</option>
      </select>
-->

Kid still tries to evaluate the variable x which is undefined because 
the for loop does not run inside the comment.

Any ideas how to reconcile both tickets? One idea is to interpolate 
variables only if there is no py:attribute and no processing instruction 
inside the comment (as in the use cases in #124). Better ideas?

-- Chris


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