string BuildFeaturePath (XmlNode parent, XmlNode child)
                {
                        if (parent == null)
                                return "/";
                        
                        List <string> path = new List <string> ();
                        
                        XmlNode cur = parent, last = null;
                        while (cur != null && cur.NodeType != XmlNodeType.Document) {
                                if (cur.NodeType == XmlNodeType.Element && cur.Name != Helpers.FakeRootName)
                                        path.Insert (0, cur.Name);
                                last = cur;
                                cur = cur.ParentNode;
                        }
                        
                        string attributes = null;
                        if (child != null && last.Name != child.Name) {
                                if (child.NodeType == XmlNodeType.Element)
                                        path.Add (child.Name);
                                
                                attributes = BuildXPathFromAttributes (child);
                        } else if (last != null)
                                attributes = BuildXPathFromAttributes (last);
                        
                        path [path.Count - 1] += attributes;
                        path.Insert (0, "/");
                        
                        return String.Join ("/", path.ToArray ());
                }               

                string BuildXPathFromAttributes (XmlNode node)
                {
                        XmlAttributeCollection attrs = node.Attributes;
                        StringBuilder sb = new StringBuilder ();
                        string and = String.Empty;
                        bool first = true;
                        
                        foreach (XmlAttribute attr in attrs) {
                                sb.AppendFormat ("{0}@{1}=\"{2}\"",
                                                 and,
                                                 attr.Name,
                                                 attr.Value);
                                if (first) {
                                        first = false;
                                        and = " and ";
                                }
                        }
                        
                        if (sb.Length == 0)
                                return String.Empty;
                        
                        sb.Insert (0, "[");
                        sb.Append ("]");
                        
                        return sb.ToString ();
                }