public override TImport Import(string filename, ContentImporterContext context)
        {
            context.Logger.PushFile(filename);

            LevelSet project = new LevelSet();

            Dictionary <int, object> objectIdDictionary = new Dictionary <int, object>();

            XmlDocument xmlDocument = new XmlDocument();

            xmlDocument.Load(filename);

            XmlNode projectNode = xmlDocument.DocumentElement;

            objectIdDictionary[Convert.ToInt32(projectNode.Attributes["id"].Value)] = project;

            foreach (XmlNode child in projectNode.ChildNodes)
            {
                if (child.Name == "tiles")
                {
                    foreach (XmlNode tileNode in child.ChildNodes)
                    {
                        project.AddTile(ParseTileNode(tileNode, project, objectIdDictionary));
                    }
                }
            }

            foreach (XmlNode child in projectNode.ChildNodes)
            {
                if (child.Name == "levels")
                {
                    foreach (XmlNode levelNode in child.ChildNodes)
                    {
                        project.Levels.Add(ParseLevelNode(levelNode, project, objectIdDictionary));
                    }
                }
            }

            context.Logger.PopFile();

            return(project);
        }