last ...

Providers/XBaseTagProvider.cs

@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
+using System.Xml;
 using xCommons.Extensions;
 using xDataService.Extensions;
 using xDataService.Models;
@@ -132,6 +133,33 @@ namespace xTagService.Providers
             return await Task.FromResult(result);
         }
 
+        /// <summary>
+        /// Extract all Referencing Models for Specified Key ...
+        /// </summary>
+        /// <param name="providedForId"></param>
+        /// <returns></returns> 
+        public async Task<IEnumerable<XReference<TKey>>> GetAllReferencings(TKey providedForId)
+        {
+            //
+            // Validate ...
+            var isValid = 
+                !providedForId.IsNull();
+                if (!isValid)
+            {
+                xExceptios.InvalidArgs.Throw();
+            }
+
+            //
+            var identifier = GetProvidedID(providedForId);
+
+            //
+            var result = TagProvider.Repository
+                .AsQueryable()
+                .Where(te => te.References.Contains(identifier))
+                .Select(te => te.References)
+                ; 
+        }
+
         /// <summary>
         /// Count References ...
         /// </summary>