Represents an atlas image.
        void ReadAtlas(XmlElement element)
        {
            SpriterAtlas atlas = new SpriterAtlas();
            m_Data.atlases.Add(atlas);
            int folderID = 0;
            string folderName = string.Empty;

            foreach(XmlAttribute attribute in element.Attributes)
            {
                // id
                if (attribute.Name.Equals("id"))
                    atlas.ID = int.Parse(attribute.Value);

                // data_path
                else if (attribute.Name.Equals("data_path"))
                    atlas.dataPath = attribute.Value;

                // image_path
                else if (attribute.Name.Equals("image_path"))
                    atlas.imagePath = attribute.Value;
            }

            foreach(XmlElement child in element)
            {
                if (child.Name.Equals("folder"))
                {
                    foreach(XmlAttribute attribute in child.Attributes)
                    {
                        // folder id
                        if (attribute.Name.Equals("id"))
                            folderID = int.Parse(attribute.Value);

                        // folder name
                        else if (attribute.Name.Equals("name"))
                            folderName = attribute.Value;
                    }

                    foreach(XmlElement child2 in child)
                    {
                        SpriterAtlasImage image = new SpriterAtlasImage();
                        atlas.images.Add(image);

                        foreach(XmlAttribute attribute in child2.Attributes)
                        {
                            // image id
                            if (attribute.Name.Equals("id"))
                                image.ID = int.Parse(attribute.Value);

                            // image full_path
                            else if (attribute.Name.Equals("full_path"))
                                image.fullPath = attribute.Value;
                        }

                        // other properties
                        image.folderID = folderID;
                        image.folderName = folderName;
                    }
                }
            }
        }