diff --git a/Extensions/xFileServiceExtensions.cs b/Extensions/xFileServiceExtensions.cs
index 6ea5897..66e692c 100644
--- a/Extensions/xFileServiceExtensions.cs
+++ b/Extensions/xFileServiceExtensions.cs
@@ -1,3 +1,4 @@
+using System.Collections.Generic;
 using xCommons.Extensions;
 using xFileService.Models.Dtos;
 using xFileService.Models.Entities;
@@ -11,7 +12,7 @@ namespace xFileService.Extensions
         /// </summary>
         /// <param name="source"></param>
         /// <returns></returns>
-        public static XFileDto ToXFileDto(this XFile source)
+        public static XFileDto ToDto(this XFile source)
         {
             //
             XFileDto result = null;
@@ -21,25 +22,54 @@ namespace xFileService.Extensions
             {
                 //
                 result = new XFileDto();
-                result = result.UpdateData(source);
-
-                //
-                // result = new XFileDto
-                // {
-                //     Id = source.Id,
-                //     Type = source.Type,
-                //     OwnerId = source.OwnerId,
-                //     Name = source.Name,
-                //     Path = source.Path,
-                //     Thumb = source.Thumb,
-                //     ThumbPath = source.ThumbPath,
-                //     UploadedOn = source.UploadedOn,
-                //     FileName = source.FileName
-                // };
+                result = result.UpdateData(
+                    updateWith: source,
+                    propertyBlackList: new List<string>
+                    {
+                        nameof(XFileDto.Owner),
+                        nameof(XFile.Deleted),
+                        nameof(XFile.References),
+                    }
+                );
             }
 
             //
             return result;
         }
+
+        /// <summary>
+        /// Converts a Dto to Entity Representation ...
+        /// Ignore ID Property ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static XFile FromDto(this XFileDto source)
+        {
+            //
+            var result = new XFile();
+
+            //
+            if (!source.IsNull())
+            {
+                //
+                result = result.UpdateData(
+                    updateWith: source,
+                    propertyBlackList: new List<string>
+                    {
+                        nameof(XFile.Deleted),
+                        nameof(XFile.References),
+                    }
+                );
+
+                //
+                if (!source.References.IsNull() && source.References.HasChild()) {
+                    result.References = source.References.ToListString();
+                }
+            }
+
+            //
+            return result;
+
+        }
     }
 }
\ No newline at end of file
diff --git a/Interfaces/IXBaseFileProvider.cs b/Interfaces/IXBaseFileProvider.cs
new file mode 100644
index 0000000..a88c7b7
--- /dev/null
+++ b/Interfaces/IXBaseFileProvider.cs
@@ -0,0 +1,211 @@
+using System;
+using System.Collections.Generic;
+using System.Linq.Expressions;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using xFileService.Models.Dtos;
+using xFileService.Models.Entities;
+using xIdentityModels.Models;
+using xModels.Dtos;
+using XFileDto = xFileService.Models.Dtos.XFileDto;
+
+// using xModels.Dtos;
+using xTagService.Interfaces;
+
+namespace xFileService.Interfaces
+{
+    public interface IXBaseFileProvider<TKey>
+    {
+        //
+        #region Props ...
+        /// <summary>
+        /// Specified Provider ...
+        /// </summary>
+        string ProvideFor { get; }
+
+        /// <summary>
+        /// Specified Provider Repositroy ...
+        /// </summary>
+        IXFileProvider Provider { get; }
+
+        /// <summary>
+        /// Tag Provider for Specified File ...
+        /// </summary>
+        /// <value></value>
+        IXBaseTagProvider<TKey> TagProvider { get; }
+        #endregion
+
+        //
+        #region Helper ...
+        /// <summary>
+        /// Get Specified Identifier ...
+        /// </summary>
+        /// <param name="forProvidedId"></param>
+        /// <returns></returns>
+        string GetIdentifier(TKey forProvidedId);
+        #endregion                
+
+        //
+        #region Implementation ...
+        /// <summary>
+        /// Stream Specified File ...
+        /// </summary>
+        /// <param name="id"></param>
+        /// <returns></returns>
+        Task<FileStreamResult> Stream(Guid id);
+
+        /// <summary>
+        /// Stream Specified File ...
+        /// </summary>
+        /// <param name="fileName"></param>
+        /// <returns></returns>
+        Task<FileStreamResult> Stream(string fileName); 
+
+
+        /// <summary>
+        /// Download Specified File ...
+        /// </summary>
+        /// <param name="id"></param>
+        /// <returns></returns>
+        Task<PhysicalFileResult> Download(Guid id);
+
+        /// <summary>
+        /// Download Specified File ...
+        /// </summary>
+        /// <param name="fileName"></param>
+        /// <returns></returns>
+        Task<PhysicalFileResult> Download(string fileName);
+
+        /// <summary>
+        /// Upload Files ...
+        /// </summary>
+        /// <param name="files"></param>
+        /// <param name="userInfo"></param>
+        /// <returns></returns>
+        Task<IEnumerable<XFileDto>> Upload(
+            IFormFileCollection files,
+            XUserClaimsInfoDto userInfo = null
+        );
+
+        /// <summary>
+        /// Remove Specified Files ...
+        /// </summary>
+        /// <param name="ids"></param>
+        /// <param name="userInfo"></param>
+        /// <returns></returns>
+        Task<IEnumerable<Guid>> Remove(
+            string ids,
+            XUserClaimsInfoDto userInfo = null
+        );
+
+        /// <summary>
+        /// Retrieve Specified File Streaming Info ...
+        /// </summary>
+        /// <param name="id"></param>
+        /// <returns></returns>
+        Task<XFileStreamDescriptorDto> GetFileDescriptor(Guid id);
+
+        /// <summary>
+        /// Retrieve Specified File Streaming Info ...
+        /// </summary>
+        /// <param name="fileName"></param>
+        /// <returns></returns>
+        Task<XFileStreamDescriptorDto> GetFileDescriptor(string fileName);
+        #endregion
+
+        //
+        #region Data Model ...
+        /// <summary>
+        /// Get Specified File Model ...
+        /// </summary>
+        /// <param name="id"></param>
+        /// <param name="ignoreSoftDeleteds"></param>
+        /// <returns></returns>
+        Task<XFileDto> Get(
+            Guid id
+        );
+
+        /// <summary>
+        /// Get All Exists File Models ...
+        /// </summary>
+        /// <param name="ignoreSoftDeleteds"></param>
+        /// <returns></returns>
+        Task<IEnumerable<XFileDto>> GetAll();
+
+        /// <summary>
+        /// find an Entity by providing a Conditional Expression ...
+        /// </summary>
+        /// <param name="whereClause"></param>
+        Task<XFileDto> FindOne(Expression<Func<XFile, bool>> whereClause);
+
+        /// <summary>
+        /// find a collection of Entities by proving a Conditional Expression ...
+        /// </summary>
+        /// <param name="whereClause"></param>
+        /// <returns></returns>
+        Task<IEnumerable<XFileDto>> FindMany(
+            Expression<Func<XFile, bool>> whereClause
+        );
+
+        /// <summary>
+        /// retrieve Entities based on XQuery Pagination structure ...
+        /// </summary>
+        /// <param name="query"></param>
+        /// <returns></returns>
+        Task<XQueryResult<XFileDto>> Query(
+            XQuery query
+        );
+
+        /// <summary>
+        /// retrieve Entities based on XQuery Pagination structure by providing a Conditional Expression ...
+        /// </summary>
+        /// <param name="whereClause"></param>
+        /// <param name="query"></param>
+        /// <returns></returns>
+        Task<XQueryResult<XFileDto>> ConditionalQuery(
+            Expression<Func<XFile, bool>> whereClause,
+            XQuery query
+        );
+
+        /// <summary>
+        /// Update an Entity values ...
+        /// </summary>
+        /// <param name="id"></param>
+        /// <param name="item"></param>
+        /// <param name="userInfo"></param>
+        /// <returns></returns>
+        Task<XFileDto> Update(
+            Guid id,
+            XFileDto item,
+            XUserClaimsInfoDto userInfo = null
+        );
+
+        /// <summary>
+        /// remove an Entity ...
+        /// </summary>
+        /// <param name="item"></param>
+        /// <param name="userInfo"></param>
+        /// <returns></returns>
+        Task<XFileDto> Remove(
+            Guid id,
+            XUserClaimsInfoDto userInfo = null
+        );
+
+        /// <summary>
+        /// count all exists Entities ...
+        /// </summary>
+        /// <returns></returns>
+        Task<int> Count();
+
+        /// <summary>
+        /// Check an Entity exists or not ...
+        /// </summary>
+        /// <param name="id"></param>
+        /// <returns></returns>
+        Task<bool> IsExists(
+            Guid id
+        );
+        #endregion
+    }
+}
\ No newline at end of file
diff --git a/Interfaces/IXFileProvider.cs b/Interfaces/IXFileProvider.cs
index d6fe1b5..cc3f315 100644
--- a/Interfaces/IXFileProvider.cs
+++ b/Interfaces/IXFileProvider.cs
@@ -29,6 +29,30 @@ namespace xFileService.Interfaces
         XDataServiceConfiguration DataSercviceConfiguration { get; }
         #endregion
 
+        //
+        #region Helpers ...
+        /// <summary>
+        /// Converts an Entity to Dto ...
+        /// </summary>
+        /// <param name="model"></param>
+        /// <returns></returns>
+        Task<XFileDto> ToDto(XFile model);
+
+        /// <summary>
+        /// Convert a List of Entities to Dto ...
+        /// </summary>
+        /// <param name="list"></param>
+        /// <returns></returns>
+        Task<IEnumerable<XFileDto>> ToDtoList(IEnumerable<XFile> list);
+
+        /// <summary>
+        /// Converts an Entity Query Result to Dto ...
+        /// </summary>
+        /// <param name="queryResult"></param>
+        /// <returns></returns>
+        Task<XQueryResult<XFileDto>> ToDtoQueryResult(XQueryResult<XFile> queryResult);
+        #endregion
+
         //
         #region Tools ...
         /// <summary>
@@ -189,29 +213,5 @@ namespace xFileService.Interfaces
             Guid id
         );
         #endregion
-
-        //
-        #region Helpers ...
-        /// <summary>
-        /// Converts an Entity to Dto ...
-        /// </summary>
-        /// <param name="model"></param>
-        /// <returns></returns>
-        Task<XFileDto> ToXFileDto(XFile model);
-
-        /// <summary>
-        /// Convert a List of Entities to Dto ...
-        /// </summary>
-        /// <param name="list"></param>
-        /// <returns></returns>
-        Task<IEnumerable<XFileDto>> ToXDtoList(IEnumerable<XFile> list);
-
-        /// <summary>
-        /// Converts an Entity Query Result to Dto ...
-        /// </summary>
-        /// <param name="queryResult"></param>
-        /// <returns></returns>
-        Task<XQueryResult<XFileDto>> ToXDtoQueryResult(XQueryResult<XFile> queryResult);
-        #endregion
     }
 }
\ No newline at end of file
diff --git a/Models/Dtos/XFileDto.cs b/Models/Dtos/XFileDto.cs
index de112ef..bdc8355 100644
--- a/Models/Dtos/XFileDto.cs
+++ b/Models/Dtos/XFileDto.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using xCommons.Constants;
 using xModels.Base;
 using xModels.Dtos;
@@ -19,5 +20,7 @@ namespace xFileService.Models.Dtos
 
         public string OwnerId { get; set; }
         public XPersonDto Owner { get; set; }
+
+        public IList<string> References = new List<string>();
     }
 }
\ No newline at end of file
diff --git a/Models/Entities/XFile.cs b/Models/Entities/XFile.cs
index 5ca1dbd..2822ce1 100644
--- a/Models/Entities/XFile.cs
+++ b/Models/Entities/XFile.cs
@@ -64,5 +64,12 @@ namespace xFileService.Models.Entities
         /// </summary>
         /// <value></value>
         public string FileName { get; set; }
+
+        /// <summary>
+        /// Comma Separated List Which Provides Pointer to Specified 
+        /// Model for Describe ...
+        /// </summary>
+        /// <value></value>
+        public string References { get; set; }        
     }
 }
\ No newline at end of file
diff --git a/Providers/XBaseFileProvider.cs b/Providers/XBaseFileProvider.cs
new file mode 100644
index 0000000..0b2bfd2
--- /dev/null
+++ b/Providers/XBaseFileProvider.cs
@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using xFileService.Interfaces;
+using xTagService.Interfaces;
+
+namespace xFileService.Providers
+{
+    public class XBaseFileProvider<TKey> : IXBaseFileProvider<TKey>
+    {
+        //
+        #region Props ...
+        /// <summary>
+        /// Specified Provider ...
+        /// </summary>
+        public string ProvideFor { get; }
+
+        /// <summary>
+        /// Specified Provider Repositroy ...
+        /// </summary>
+        public IXFileProvider Provider { get; }
+
+        /// <summary>
+        /// Tag Provider for Specified File ...
+        /// </summary>
+        /// <value></value>
+        public IXBaseTagProvider<TKey> TagProvider { get; }
+        #endregion
+
+        
+    }
+}
\ No newline at end of file
diff --git a/Providers/XFileProvider.cs b/Providers/XFileProvider.cs
index 97ba421..681d3fe 100644
--- a/Providers/XFileProvider.cs
+++ b/Providers/XFileProvider.cs
@@ -57,6 +57,106 @@ namespace xFileService.Providers
         }
         #endregion
 
+        //
+        #region Helpers ...
+        /// <summary>
+        /// Converts an Entity to Dto ...
+        /// </summary>
+        /// <param name="model"></param>
+        /// <returns></returns>
+        public async Task<XFileDto> ToDto(XFile model)
+        {
+            //
+            XFileDto result = null;
+
+            //
+            if (!model.IsNullOrDefault())
+            {
+                //
+                result = model.ToDto();
+
+                //
+                // Prepare Inner API Providers Device Dto ...
+                var device = IdentityProvider.GetDevice();
+                var userInfo = await IdentityProvider.GetUserInfo(
+                    device: device,
+                    userSelectByParam: model.OwnerId
+                );
+                if (userInfo.IsNullOrDefault())
+                {
+                    XException.NotFound.Throw();
+                }
+
+                //
+                result.Owner = userInfo.ToXPersonDto();
+            }
+
+            //
+            return result;
+        }
+
+        /// <summary>
+        /// Convert a List of Entities to Dto ...
+        /// </summary>
+        /// <param name="list"></param>
+        /// <returns></returns>
+        public async Task<IEnumerable<XFileDto>> ToDtoList(IEnumerable<XFile> list)
+        {
+            //
+            var result = new List<XFileDto>();
+
+            //
+            if (!list.IsNull() && list.HasChild())
+            {
+                //
+                foreach (var item in list)
+                {
+                    //
+                    var dto = await ToDto(item);
+                    if (!dto.IsNullOrDefault())
+                    {
+                        result.Add(dto);
+                    }
+                }
+            }
+
+            //
+            return result;
+        }
+
+        /// <summary>
+        /// Converts an Entity Query Result to Dto ...
+        /// </summary>
+        /// <param name="queryResult"></param>
+        /// <returns></returns>
+        public async Task<XQueryResult<XFileDto>> ToDtoQueryResult(XQueryResult<XFile> queryResult)
+        {
+            //
+            var result = new XQueryResult<XFileDto>();
+
+            //
+            if (!queryResult.IsNullOrDefault())
+            {
+                //
+                result.Page = queryResult.Page;
+                result.PageSize = queryResult.PageSize;
+                result.TotalItems = queryResult.TotalItems;
+                result.TotalPages = queryResult.TotalPages;
+                result.TotalFilteredItems = queryResult.TotalFilteredItems;
+                result.TotalFilteredPages = queryResult.TotalFilteredPages;
+
+                //
+                if (!queryResult.Items.IsNull() && queryResult.Items.HasChild())
+                {
+                    result.Items = await ToDtoList(queryResult.Items);
+                }
+            }
+
+            //
+            return result;
+        }
+        #endregion
+
         //
         #region Tools ...
         /// <summary>
@@ -280,7 +380,7 @@ namespace xFileService.Providers
 
             //
             // Preparing Result ...
-            var result = await ToXDtoList(entities);
+            var result = await ToDtoList(entities);
 
             //
             return result;
@@ -569,7 +669,7 @@ namespace xFileService.Providers
             }
 
             //
-            var result = await ToXFileDto(entitiy);
+            var result = await ToDto(entitiy);
             if (result.IsNullOrDefault())
             {
                 XException.ActionFailed.Throw();
@@ -594,7 +694,7 @@ namespace xFileService.Providers
             if (!entities.IsNull() && entities.HasChild())
             {
                 //
-                result = (await ToXDtoList(entities))
+                result = (await ToDtoList(entities))
                     .ToList();
             }
 
@@ -615,7 +715,7 @@ namespace xFileService.Providers
             var entity = await FileRepository.FindOneAsync(whereClause);
             if (!entity.IsNullOrDefault())
             {
-                result = await ToXFileDto(entity);
+                result = await ToDto(entity);
             }
 
             //
@@ -639,7 +739,7 @@ namespace xFileService.Providers
             if (!entities.IsNull() && entities.HasChild())
             {
                 //
-                result = (await ToXDtoList(entities))
+                result = (await ToDtoList(entities))
                     .ToList();
             }
 
@@ -663,7 +763,7 @@ namespace xFileService.Providers
             var queryResult = await FileRepository.QueryAsync(query);
             if (!queryResult.IsNullOrDefault())
             {
-                result = await ToXDtoQueryResult(queryResult);
+                result = await ToDtoQueryResult(queryResult);
             }
 
             //
@@ -691,7 +791,7 @@ namespace xFileService.Providers
             );
             if (!queryResult.IsNullOrDefault())
             {
-                result = await ToXDtoQueryResult(queryResult);
+                result = await ToDtoQueryResult(queryResult);
             }
 
             //
@@ -771,7 +871,7 @@ namespace xFileService.Providers
             }
 
             //
-            var result = await ToXFileDto(entity);
+            var result = await ToDto(entity);
 
             //
             return result;
@@ -832,7 +932,7 @@ namespace xFileService.Providers
             }
 
             //
-            result = await ToXFileDto(entitiy);
+            result = await ToDto(entitiy);
             if (result.IsNullOrDefault())
             {
                 XException.ActionFailed.Throw();
@@ -863,105 +963,5 @@ namespace xFileService.Providers
             return await FileRepository.IsExistsAsync(id);
         }
         #endregion
-
-        //
-        #region Helpers ...
-        /// <summary>
-        /// Converts an Entity to Dto ...
-        /// </summary>
-        /// <param name="model"></param>
-        /// <returns></returns>
-        public async Task<XFileDto> ToXFileDto(XFile model)
-        {
-            //
-            XFileDto result = null;
-
-            //
-            if (!model.IsNullOrDefault())
-            {
-                //
-                result = model.ToXFileDto();
-
-                //
-                // Prepare Inner API Providers Device Dto ...
-                var device = IdentityProvider.GetDevice();
-                var userInfo = await IdentityProvider.GetUserInfo(
-                    device: device,
-                    userSelectByParam: model.OwnerId
-                );
-                if (userInfo.IsNullOrDefault())
-                {
-                    XException.NotFound.Throw();
-                }
-
-                //
-                result.Owner = userInfo.ToXPersonDto();
-            }
-
-            //
-            return result;
-        }
-
-        /// <summary>
-        /// Convert a List of Entities to Dto ...
-        /// </summary>
-        /// <param name="list"></param>
-        /// <returns></returns>
-        public async Task<IEnumerable<XFileDto>> ToXDtoList(IEnumerable<XFile> list)
-        {
-            //
-            var result = new List<XFileDto>();
-
-            //
-            if (!list.IsNull() && list.HasChild())
-            {
-                //
-                foreach (var item in list)
-                {
-                    //
-                    var dto = await ToXFileDto(item);
-                    if (!dto.IsNullOrDefault())
-                    {
-                        result.Add(dto);
-                    }
-                }
-            }
-
-            //
-            return result;
-        }
-
-        /// <summary>
-        /// Converts an Entity Query Result to Dto ...
-        /// </summary>
-        /// <param name="queryResult"></param>
-        /// <returns></returns>
-        public async Task<XQueryResult<XFileDto>> ToXDtoQueryResult(XQueryResult<XFile> queryResult)
-        {
-            //
-            var result = new XQueryResult<XFileDto>();
-
-            //
-            if (!queryResult.IsNullOrDefault())
-            {
-                //
-                result.Page = queryResult.Page;
-                result.PageSize = queryResult.PageSize;
-                result.TotalItems = queryResult.TotalItems;
-                result.TotalPages = queryResult.TotalPages;
-                result.TotalFilteredItems = queryResult.TotalFilteredItems;
-                result.TotalFilteredPages = queryResult.TotalFilteredPages;
-
-                //
-                if (!queryResult.Items.IsNull() && queryResult.Items.HasChild())
-                {
-                    result.Items = await ToXDtoList(queryResult.Items);
-                }
-            }
-
-            //
-            return result;
-        }
-        #endregion
     }
 }
\ No newline at end of file