 class="identifier">xy</span><span class="special">;</span>
    <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">linestring</span><span class="special">&lt;</span><span class="identifier">xy</span><span class="special">&gt;</span> <span class="identifier">line</span><span class="special">;</span>
    <span class="identifier">li