/// <summary>
        /// Converts FB2 section element
        /// </summary>
        /// <param name="sectionItem">item to convert</param>
        /// <returns>XHTML representation</returns>
        public List<IHTMLItem> Convert(SectionItem sectionItem)
        {
            if (sectionItem == null)
            {
                throw new ArgumentNullException("sectionItem");
            }
            var resList = new List<IHTMLItem>();
            Logger.Log.Debug("Converting section");

            var content = new Div(HTMLElementType.HTML5);
            ulong documentSize = 0;
            _checker.MaxSizeLimit = Settings.MaxSize;

            SetClassType(content, string.Format(ElementStylesV3.SectionItemFormat, RecursionLevel));

            content.GlobalAttributes.ID.Value = Settings.ReferencesManager.AddIdUsed(sectionItem.ID, content);

            if (sectionItem.Lang != null)
            {
                content.GlobalAttributes.Language.Value = sectionItem.Lang;
            }

            // Load Title
            if (sectionItem.Title != null)
            {
                IHTMLItem titleItem;
                if (!LinkSection)
                {
                    var titleConverter = new TitleConverterV3();
                    titleItem = titleConverter.Convert(sectionItem.Title,
                        new TitleConverterParamsV3 { Settings = Settings, TitleLevel = RecursionLevel + 1 });
                }
                else
                {
                    var linkSectionConverter = new LinkSectionConverterV3();
                    titleItem = linkSectionConverter.Convert(sectionItem,
                        new LinkSectionConverterParamsV3 { Settings = Settings });
                }
                if (titleItem != null)
                {
                    documentSize = SplitBlockHTMLItem(titleItem,content,resList,documentSize);
                }
            }

            // Load epigraphs
            documentSize = (from epigraph in sectionItem.Epigraphs let epigraphConverter = new EpigraphConverterV3() select epigraphConverter.Convert(epigraph, new EpigraphConverterParamsV3 {Settings = Settings, Level = RecursionLevel + 1})).Aggregate(documentSize, (current, epigraphItem) => SplitBlockHTMLItem(epigraphItem, content, resList, current));

            // Load section image
            if (Settings.Images.HasRealImages())
            {
                documentSize = sectionItem.SectionImages.Aggregate(documentSize, (current, sectionImage) => ConvertSectionImage(sectionImage, content, resList, current));
            }

            // Load annotations
            if (sectionItem.Annotation != null)
            {
                var annotationConverter = new AnnotationConverterV3();
                IHTMLItem annotationItem = annotationConverter.Convert(sectionItem.Annotation, new AnnotationConverterParamsV3 { Level = RecursionLevel + 1, Settings = Settings });
                documentSize = SplitBlockHTMLItem(annotationItem, content, resList, documentSize);
            }

            // Parse all elements only if section has no sub section
            if (sectionItem.SubSections.Count == 0)
            {
                bool startSection = true;
                sectionItem.Content.Aggregate(documentSize, (current, item) => ConvertSimpleSubItem(item, sectionItem, content, resList, ref startSection, current));
            }

            resList.Add(content);
            return resList;
        }
        /// <summary>
        /// Converts FB2 section element
        /// </summary>
        /// <param name="sectionItem">item to convert</param>
        /// <returns>XHTML representation</returns>
        public List <IHTMLItem> Convert(SectionItem sectionItem)
        {
            if (sectionItem == null)
            {
                throw new ArgumentNullException("sectionItem");
            }
            var resList = new List <IHTMLItem>();

            Logger.Log.Debug("Converting section");

            var   content      = new Div(HTMLElementType.HTML5);
            ulong documentSize = 0;

            _checker.MaxSizeLimit = Settings.MaxSize;

            SetClassType(content, string.Format(ElementStylesV3.SectionItemFormat, RecursionLevel));

            content.GlobalAttributes.ID.Value = Settings.ReferencesManager.AddIdUsed(sectionItem.ID, content);

            if (sectionItem.Lang != null)
            {
                content.GlobalAttributes.Language.Value = sectionItem.Lang;
            }


            // Load Title
            if (sectionItem.Title != null)
            {
                IHTMLItem titleItem;
                if (!LinkSection)
                {
                    var titleConverter = new TitleConverterV3();
                    titleItem = titleConverter.Convert(sectionItem.Title,
                                                       new TitleConverterParamsV3 {
                        Settings = Settings, TitleLevel = RecursionLevel + 1
                    });
                }
                else
                {
                    var linkSectionConverter = new LinkSectionConverterV3();
                    titleItem = linkSectionConverter.Convert(sectionItem,
                                                             new LinkSectionConverterParamsV3 {
                        Settings = Settings
                    });
                }
                if (titleItem != null)
                {
                    documentSize = SplitBlockHTMLItem(titleItem, content, resList, documentSize);
                }
            }

            // Load epigraphs
            documentSize = (from epigraph in sectionItem.Epigraphs let epigraphConverter = new EpigraphConverterV3() select epigraphConverter.Convert(epigraph, new EpigraphConverterParamsV3 {
                Settings = Settings, Level = RecursionLevel + 1
            })).Aggregate(documentSize, (current, epigraphItem) => SplitBlockHTMLItem(epigraphItem, content, resList, current));

            // Load section image
            if (Settings.Images.HasRealImages())
            {
                documentSize = sectionItem.SectionImages.Aggregate(documentSize, (current, sectionImage) => ConvertSectionImage(sectionImage, content, resList, current));
            }

            // Load annotations
            if (sectionItem.Annotation != null)
            {
                var       annotationConverter = new AnnotationConverterV3();
                IHTMLItem annotationItem      = annotationConverter.Convert(sectionItem.Annotation, new AnnotationConverterParamsV3 {
                    Level = RecursionLevel + 1, Settings = Settings
                });
                documentSize = SplitBlockHTMLItem(annotationItem, content, resList, documentSize);
            }

            // Parse all elements only if section has no sub section
            if (sectionItem.SubSections.Count == 0)
            {
                bool startSection = true;
                sectionItem.Content.Aggregate(documentSize, (current, item) => ConvertSimpleSubItem(item, sectionItem, content, resList, ref startSection, current));
            }

            resList.Add(content);
            return(resList);
        }