mapnik/tests/data/broken_maps/line_cap_style_broken.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE Map  >
<Map background-color="red">
    <Style name="some_style">
      <Rule name="some_rule">
        <LineSymbolizer stroke-linecap="fooish" />
      </Rule>
    </Style>
</Map>