string curvesXPath = fullName("edges") + "/" + fullName("Edge") + "[@cubics!='']";
foreach (XmlElement edgeNode in element.SelectNodes(curvesXPath, _nsmgr))
{
    string curvesString = edgeNode.Attributes["cubics"].InnerText;
    if (!string.IsNullOrEmpty(curvesString))
    {
        var trimmedString = curvesString.Trim('!');
        var s = trimmedString.Split('(');
        var points = s[1].Split(';')[1].Split(')')[0].Split('q');
        var curvePoints = points[0].Split(' ');
        var start = convertStringToPoint(s[0]);
        var end = convertStringToPoint(curvePoints[2]);
        // now let's find all quadratic curve stubs we read and replace them with cubic curves
        bool removedAny = false;
        foreach (var point in points.Skip(1).Select(p => convertStringToPoint(p.Split('Q')[0])))
        {
            removedAny = true;
            // hack to make closure capture by value
            PointF point1 = point;
            _edges.RemoveAll(e => e.start == point1 && e.a.IsEmpty);
        }
        if (removedAny)
        {
            _edges.Add(new FlaEdge
                           {
                               start = start,
                               a = convertStringToPoint(curvePoints[0]),
                               b = convertStringToPoint(curvePoints[1]),
                               end = end
                           });
        }
    }
}