/// <summary>
 /// Convert from MediaWiki categories to MindTouch tags
 /// </summary>
 public void ConvertCategories() {
     Console.Out.Write("Migrating categories... ");
     Dictionary<string, List<string>> pageToCategoryMap = MediaWikiDA.GetCategoryNamesByPage();
     var tagBL = new TagBL();
     foreach(KeyValuePair<string, List<string>> categoriesByPage in pageToCategoryMap) {
         TagBE[] tags = new TagBE[categoriesByPage.Value.Count];
         for(int i = 0; i < tags.Length; i++) {
             TagBE categoryTag = new TagBE();
             categoryTag.Type = TagType.TEXT;
             categoryTag.Name = categoriesByPage.Value[i];
             tags[i] = categoryTag;
         }
         ulong pageID;
         if(_MWToDWPageIDMap.TryGetValue(categoriesByPage.Key, out pageID)) {
             tagBL.InsertTags(pageID, tags);
         }
     }
     Console.Out.WriteLine("Done!");
 }