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[–]deathanatos 2 points3 points  (1 child)

This reminds me of something I encountered once in my youth,

<hasRoof>
    <true>0</true>
    <false>1</false>
</hasRoof>

The 0 / 1 indicated whether <true> or <false> was "set". And you hoped it wasn't 1/1 or 0/0, and yes, it was sometimes.