diff --git a/include/INxData.h b/include/INxData.h
index 47b5005fdd1b0d8a58fb9ee434dcb856512a794d..ca69f8b2605a43cbab7ea4bf04ba12a858a37f6d 100644
--- a/include/INxData.h
+++ b/include/INxData.h
@@ -21,17 +21,17 @@ namespace NJGIS
         public:
             virtual int isExist();
             
-            virtual int getID(std::string& id) = 0;
+            virtual const char* getID() = 0;
 
-            virtual int getTag(std::string& tag) = 0;
+            virtual const char* getTag() = 0;
 
-            virtual int getGenarationDateTime(std::string& datetime) = 0;
+            virtual const char* getGenarationDateTime() = 0;
 
-            virtual int getType(NJGIS::SERVICE::NjDataType& type) = 0;
+            virtual NJGIS::SERVICE::NjDataType getType() = 0;
 
-            virtual int getSize(int& size) = 0;
+            virtual int getSize() = 0;
 
-            virtual int getValue(std::string& value) = 0;
+            virtual const char* getValue() = 0;
 
             virtual int save(const char* path) = 0;
         };
diff --git a/include/INxModelServiceRecord.h b/include/INxModelServiceRecord.h
index bfe9ba55fc799bc2e9c2d1a2220cc60b31f446c8..f4a038ee3180bf5c958f2bd8bf09027c0b422e9d 100644
--- a/include/INxModelServiceRecord.h
+++ b/include/INxModelServiceRecord.h
@@ -4,8 +4,9 @@
 #include <vector>
 #include <string>
 
-#include "INxUnknown.h"
+#include "INxService.h"
 #include "INxDataConfiguration.h"
+#include "INxModelService.h"
 
 
 namespace NJGIS
@@ -20,22 +21,24 @@ namespace NJGIS
         } NjRecordStatus;
 
 
-        class INjModelServiceRecord : public virtual INxUnknown
+        class INjModelServiceRecord : public virtual INjService
         {
         public:
-            virtual int getID(std::string& id) = 0;
+            virtual const char* getID() = 0;
 
-            virtual int getServiceID(std::string& id) = 0;
+            virtual const char* getModelServiceID() = 0;
 
-            virtual int getStartDatetime(std::string& datetime) = 0;
+			virtual INjModelService* getModelService() = 0;
 
-            virtual int getTimeSpan(int& span) = 0;
+            virtual const char* getStartDatetime() = 0;
 
-            virtual int getInputData(INjDataConfiguration* &input) = 0;
+            virtual int getTimeSpan() = 0;
 
-            virtual int getOutputData(INjDataConfiguration* &output) = 0;
+            virtual INjDataConfiguration* getInputData() = 0;
 
-            virtual int getStatus(NjRecordStatus& status) = 0;
+            virtual INjDataConfiguration* getOutputData() = 0;
+
+            virtual NjRecordStatus getStatus() = 0;
 
             virtual int getRunningInfo(std::string& stardout, std::string& standerr, std::string& invokeerr) = 0;
 
diff --git a/include/INxServiceAccess.h b/include/INxServiceAccess.h
index b59c894e33b77b4380b9e86cf6369fee28519277..ca3c4da47c96fd9a28b8a07e243b5aa3e8b02ff7 100644
--- a/include/INxServiceAccess.h
+++ b/include/INxServiceAccess.h
@@ -2,6 +2,7 @@
 #define __NJGIS_INJSERVICEACCESS_H__
 
 #include "INxModelService.h"
+#include "INxData.h"
 #include <vector>
 
 namespace NJGIS
@@ -19,6 +20,9 @@ namespace NJGIS
 
             //! get model servcie by name
             virtual int getModelServicesByName(const char* name, std::vector<NJGIS::SERVICE::INjService*> &list) = 0;
+
+			//! get a data service
+			virtual NJGIS::SERVICE::INjData* getDataServiceByID(const char* id) = 0;
         };
 
 	}
diff --git a/src/NxData.cpp b/src/NxData.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a3dde8884acfea025e7f1c0bde52acde691a27d5
--- /dev/null
+++ b/src/NxData.cpp
@@ -0,0 +1,42 @@
+#include "NxData.h"
+
+int NJGIS::SERVICE::NjData::isExist()
+{
+	return NULL;
+}
+
+const char* NJGIS::SERVICE::NjData::getID()
+{
+	return NULL;
+}
+
+const char* NJGIS::SERVICE::NjData::getTag()
+{
+	return NULL;
+}
+
+const char* NJGIS::SERVICE::NjData::getGenarationDateTime()
+{
+	return NULL;
+}
+
+NJGIS::SERVICE::NjDataType NJGIS::SERVICE::NjData::getType()
+{
+	return this->_type;
+}
+
+int NJGIS::SERVICE::NjData::getSize()
+{
+	return NULL;
+}
+
+const char* NJGIS::SERVICE::NjData::getValue()
+{
+	return NULL;
+}
+
+int NJGIS::SERVICE::NjData::save( const char* path )
+{
+	return NULL;
+}
+
diff --git a/src/NxData.h b/src/NxData.h
new file mode 100644
index 0000000000000000000000000000000000000000..825a895275e0e078dc8dfc1e898f84bc95ecaa10
--- /dev/null
+++ b/src/NxData.h
@@ -0,0 +1,47 @@
+#ifndef __NJGIS_NJDATA_H__
+#define __NJGIS_NJDATA_H__
+
+#include "../include/INxData.h"
+#include "NxService.h"
+
+namespace NJGIS
+{
+	namespace SERVICE
+	{
+		class NjData : public virtual INjData, public virtual NjService
+		{
+		public:
+			virtual int isExist();
+
+			virtual const char* getID();
+
+			virtual const char* getTag();
+
+			virtual const char* getGenarationDateTime();
+
+			virtual NJGIS::SERVICE::NjDataType getType();
+
+			virtual int getSize();
+
+			virtual const char* getValue();
+
+			virtual int save( const char* path );
+
+		private:
+			std::string _id;
+
+			std::string _tag;
+
+			int _size;
+
+			std::string _genarationDateTime;
+
+			NJGIS::SERVICE::NjDataType _type;
+
+			std::string _value;
+
+		};
+	}
+}
+
+#endif
\ No newline at end of file
diff --git a/src/NxDataFactory.cpp b/src/NxDataFactory.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..414625d202c81464bcb785b7ac9b3156ccde096e
--- /dev/null
+++ b/src/NxDataFactory.cpp
@@ -0,0 +1,6 @@
+#include "NxDataFactory.h"
+
+NJGIS::SERVICE::INjData* NJGIS::SERVICE::NjDataFactory::createDataByJSON( Json::Value jData, const char* ip, int port )
+{
+	return NULL;
+}
\ No newline at end of file
diff --git a/src/NxDataFactory.h b/src/NxDataFactory.h
new file mode 100644
index 0000000000000000000000000000000000000000..528aec4bec2638606cf248d527399663e09125ec
--- /dev/null
+++ b/src/NxDataFactory.h
@@ -0,0 +1,19 @@
+#ifndef __NJGIS_NJDATAFACTORY_H__
+#define __NJGIS_NJDATAFACTORY_H__
+
+#include "../include/INxData.h"
+#include "json/json.h"
+
+namespace NJGIS
+{
+	namespace SERVICE
+	{
+		class NjDataFactory
+		{
+		public:
+			static NJGIS::SERVICE::INjData* createDataByJSON(Json::Value jData, const char* ip, int port);
+		};
+	}
+}
+
+#endif
\ No newline at end of file
diff --git a/src/NxModelService.cpp b/src/NxModelService.cpp
index 943758a229418e9b8a35bfbba59975aea805b6bc..a39a008ab43534f78921b8211d1fe6971519e6c6 100644
--- a/src/NxModelService.cpp
+++ b/src/NxModelService.cpp
@@ -92,5 +92,6 @@ int NJGIS::SERVICE::NjModelService::invoke( const INjDataConfiguration* config,
 
 int NJGIS::SERVICE::NjModelService::refresh()
 {
+	//! TODO DX 
 	return NULL;
 }
diff --git a/src/NxModelService.h b/src/NxModelService.h
index 6d59776677937acbd0fb5bf4600e78652e518aac..bd657fdc97dbc78021382d1d3e6cf00be78ac623 100644
--- a/src/NxModelService.h
+++ b/src/NxModelService.h
@@ -90,6 +90,7 @@ namespace NJGIS
 
 			virtual int invoke( const INjDataConfiguration* config, std::string& recordid );
 
+			//! to refresh the information of this model service
 			virtual int refresh();
 
 		private:
diff --git a/src/NxModelServiceRecord.cpp b/src/NxModelServiceRecord.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..baa9dce2c87cfd14d88f21f8061868acf1708353
--- /dev/null
+++ b/src/NxModelServiceRecord.cpp
@@ -0,0 +1 @@
+#include "INxModelServiceRecord.h"
diff --git a/src/NxModelServiceRecord.h b/src/NxModelServiceRecord.h
new file mode 100644
index 0000000000000000000000000000000000000000..3ff240c3cba5f99295a26f582503ee1c80677987
--- /dev/null
+++ b/src/NxModelServiceRecord.h
@@ -0,0 +1,19 @@
+#ifndef __NJGIS_NJMODELSERVICERECORD_H__
+#define __NJGIS_NJMODELSERVICERECORD_H__
+
+#include "../include/INxModelServiceRecord.h"
+#include "NxService.h"
+
+namespace NJGIS
+{
+	namespace SERVICE
+	{
+		class NxModelServiceRecord : public virtual INjModelServiceRecord, public virtual NjService
+		{
+		public:
+
+		};
+	}
+}
+
+#endif
\ No newline at end of file
diff --git a/src/NxServiceAccess.cpp b/src/NxServiceAccess.cpp
index b3e387fed4e8447f8c2d688d84a4791abad0f267..0260f570d3a7b4a86ea1ce98923e0c1f591a3742 100644
--- a/src/NxServiceAccess.cpp
+++ b/src/NxServiceAccess.cpp
@@ -48,5 +48,12 @@ NJGIS::SERVICE::INjModelService* NJGIS::SERVICE::NjServiceAccess::getModelServic
 
 int NJGIS::SERVICE::NjServiceAccess::getModelServicesByName( const char* name, std::vector<NJGIS::SERVICE::INjService*> &list )
 {
-	throw std::exception("The method or operation is not implemented.");
-}
\ No newline at end of file
+	//! TODO DX
+	return NULL:
+}
+
+NJGIS::SERVICE::INjData* NJGIS::SERVICE::NjServiceAccess::getDataServiceByID( const char* id )
+{
+	// TODO YL
+	return NULL:
+}
diff --git a/src/NxServiceAccess.h b/src/NxServiceAccess.h
index a79c9f5b2da4bef3d41ed6a2842b1628c06401e9..d0451f175e2bdd763edeac5fe22ee2fa79269f18 100644
--- a/src/NxServiceAccess.h
+++ b/src/NxServiceAccess.h
@@ -19,6 +19,9 @@ namespace NJGIS
 			virtual NJGIS::SERVICE::INjModelService* getModelServiceByOID( const char* oid );
 
 			virtual int getModelServicesByName( const char* name, std::vector<NJGIS::SERVICE::INjService*> &list );
+
+			virtual NJGIS::SERVICE::INjData* getDataServiceByID( const char* id );
+
 		};
 	}
 }