diff --git a/v1_5_0/CDT-AE-v1_5_0.xsd b/v1_5_0/CDT-AE-v1_5_0.xsd
index 07e3faf0e80c82b67426420dc1f99c3a13dfee2c..c47f986835607c1c71c4137f56ab73c67db2f296 100644
--- a/v1_5_0/CDT-AE-v1_5_0.xsd
+++ b/v1_5_0/CDT-AE-v1_5_0.xsd
@@ -48,6 +48,7 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 						<xs:element name="ontologyRef" type="xs:anyURI" minOccurs="0" />
 						<xs:element name="nodeLink" type="xs:anyURI" minOccurs="0" />
 						<xs:element name="requestReachability" type="xs:boolean" />
+						<xs:element name="contentSerialization" type="m2m:serializations" minOccurs="0" />
 
 						<!-- Child Resources -->
 						<xs:choice minOccurs="0" maxOccurs="1">
@@ -81,6 +82,7 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 						<xs:element name="ontologyRef" type="xs:anyURI" minOccurs="0" />
 						<xs:element name="nodeLink" type="xs:anyURI" minOccurs="0" />
 						<xs:element name="requestReachability" type="xs:boolean" minOccurs="0" />
+						<xs:element name="contentSerialization" type="m2m:serializations" minOccurs="0" />
 
 						<!-- Child Resources -->
 						<xs:choice minOccurs="0" maxOccurs="1">
diff --git a/v1_5_0/CDT-commonTypes-v1_5_0.xsd b/v1_5_0/CDT-commonTypes-v1_5_0.xsd
index bd8ecb59d378e6c46bb932cd13fb73696d6a717e..55239361205e5efc63f412ec76dc1915a52d72d9 100644
--- a/v1_5_0/CDT-commonTypes-v1_5_0.xsd
+++ b/v1_5_0/CDT-commonTypes-v1_5_0.xsd
@@ -135,11 +135,12 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 			<xs:minLength value="1" /> 
 		</xs:restriction> 
 	</xs:simpleType>
+	
 
-    <!--Format is YYYYMMDDThhmmss with no punctuation -->
+    <!--Format is YYYYMMDDThhmmss,ssssss with optional up to 6 digits of fractional seconds -->
 	<xs:simpleType name="timestamp">
 		<xs:restriction base="xs:string">
-			<xs:pattern value="\d{4}(0[1-9]|1[0-2])(0[1-9]|[1-2]\d|30|31)T([01]\d|2[0-3])[0-5]\d[0-5]\d"></xs:pattern>
+			<xs:pattern value="\d{4}(0[1-9]|1[0-2])(0[1-9]|[1-2]\d|30|31)T([01]\d|2[0-3])[0-5]\d[0-5]\d(,\d{1,6})?"></xs:pattern>
 		</xs:restriction>
 	</xs:simpleType>
 	
@@ -163,7 +164,27 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
             <xs:pattern value="[\w/!#$^_.+&amp;\-]+" />
         </xs:restriction>
     </xs:simpleType>
+	
+	
+	<!-- auxiliary data type required to define "serializations" below -->
+	<xs:simpleType name="permittedMediaTypes"> 
+		<xs:restriction base="m2m:typeOfContent">
+		   <xs:enumeration value="application/xml" />
+		   <xs:enumeration value="application/json" />
+		</xs:restriction>
+	</xs:simpleType> 
+
+	<!-- "serializations" data type is a list of permitted media types as defined above -->
+	<xs:simpleType name="serializations"> 
+		<xs:restriction>
+			<xs:simpleType>
+				<xs:list itemType="m2m:permittedMediaTypes" />
+			</xs:simpleType>
+			<xs:minLength value="1" />
+		</xs:restriction>
+	</xs:simpleType> 
 
+	
 	<xs:simpleType name="contentInfo">
 		<xs:restriction base="xs:string">
 			<xs:pattern value="[\w/!#$^_.+&amp;\-]+(:[0-2])?" />
@@ -454,7 +475,16 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
     <xs:complexType name="responseTypeInfo">
         <xs:sequence>
             <xs:element name="responseTypeValue" type="m2m:responseType" />
-            <xs:element name="notificationURI" type="xs:anyURI" minOccurs="0" maxOccurs="unbounded" />
+            <xs:element name="notificationURI">
+        	   <xs:simpleType>
+        		  <xs:restriction> 
+        			<xs:simpleType> 
+        				<xs:list itemType="xs:anyURI" /> 
+        			</xs:simpleType> 
+        			<xs:minLength value="0" /> 
+        	      </xs:restriction> 
+        	   </xs:simpleType>
+            </xs:element>
         </xs:sequence>
     </xs:complexType>
     
diff --git a/v1_5_0/CDT-enumerationTypes-v1_5_0.xsd b/v1_5_0/CDT-enumerationTypes-v1_5_0.xsd
index 4b65c8cb654ec3376592f3ed61e6d5e859fdcd44..a11af668897099dc3b62e18c63762749f3319b6a 100644
--- a/v1_5_0/CDT-enumerationTypes-v1_5_0.xsd
+++ b/v1_5_0/CDT-enumerationTypes-v1_5_0.xsd
@@ -256,7 +256,9 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
             <!-- NO_PRIVILEGE              -->
             <xs:enumeration value="5105" />            
             <!-- ALREADY_EXISTS            -->
-            <xs:enumeration value="5106" />            
+            <xs:enumeration value="5106" />
+			<!-- NOT_ACCEPTABLE            -->
+			<xs:enumeration value="5107" />
             <!-- TARGET_NOT_SUBSCRIBABLE   -->
             <xs:enumeration value="5203" />            
             <!-- SUBSCRIPTION_VERIFICATION_INITIATION_FAILED   -->
@@ -533,7 +535,8 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 
 	<xs:simpleType name="notificationEventType">
 		<xs:annotation>
-			<xs:documentation>Used in the notificationEventType element of eventNotificationCriteria attribute of subscruiption resource</xs:documentation>
+			<xs:documentation>Used in the notificationEventType element of eventNotificationCriteria attribute of subscription resource 
+			 and in the Notification data object</xs:documentation>
 		</xs:annotation>
 		<xs:restriction base="xs:integer">
 			<!-- Update of Resource -->
diff --git a/v1_5_0/CDT-group-v1_5_0.xsd b/v1_5_0/CDT-group-v1_5_0.xsd
index 8fdd673e293751eec99495438a1005ce62b19581..d28deba47964d2d1ea10bec70e41910a2a2096e9 100644
--- a/v1_5_0/CDT-group-v1_5_0.xsd
+++ b/v1_5_0/CDT-group-v1_5_0.xsd
@@ -39,8 +39,8 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 					<xs:sequence>					
                         <xs:element name="creator" type="m2m:ID" minOccurs="0" />					
 						<xs:element name="memberType" type="m2m:memberType" />
-						<xs:element name="currentNrOfMembers" type="xs:nonNegativeInteger" />
-						<xs:element name="maxNrOfMembers" type="xs:nonNegativeInteger" />
+						<xs:element name="currentNrOfMembers" type="xs:positiveInteger" />
+						<xs:element name="maxNrOfMembers" type="xs:positiveInteger" />
 						<xs:element name="memberIDs" type="m2m:listOfURIs" />
 						<xs:element name="membersAccessControlPolicyIDs" type="m2m:listOfURIs" minOccurs="0" />
 						<xs:element name="memberTypeValidated" type="xs:boolean" />
@@ -68,8 +68,8 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 					<!-- Resource Specific Attributes -->
 					<xs:sequence>
 						<xs:element name="memberType" type="m2m:memberType" minOccurs="0" />
-						<xs:element name="currentNrOfMembers" type="xs:nonNegativeInteger" minOccurs="0" />
-						<xs:element name="maxNrOfMembers" type="xs:nonNegativeInteger" minOccurs="0" />
+						<xs:element name="currentNrOfMembers" type="xs:positiveInteger" minOccurs="0" />
+						<xs:element name="maxNrOfMembers" type="xs:positiveInteger" minOccurs="0" />
 						<xs:element name="memberIDs" type="m2m:listOfURIs" minOccurs="0" />
 						<xs:element name="membersAccessControlPolicyIDs" type="m2m:listOfURIs" minOccurs="0" />
 						<xs:element name="memberTypeValidated" type="xs:boolean" minOccurs="0" />
diff --git a/v1_5_0/CDT-notification-v1_5_0.xsd b/v1_5_0/CDT-notification-v1_5_0.xsd
index f511d5e95d8bc4c7245d219f71c0f28ac6d36cf3..6c6dba46e791caea192e4c0e99a91f98b6e1db6b 100644
--- a/v1_5_0/CDT-notification-v1_5_0.xsd
+++ b/v1_5_0/CDT-notification-v1_5_0.xsd
@@ -51,7 +51,8 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
                                                    <xs:element name="originator" type="m2m:ID" minOccurs="0"/>
                                                </xs:sequence>
                                          </xs:complexType>
-                                      </xs:element>
+                                      </xs:element>                              
+                                      <xs:element name="notificationEventType" type="m2m:notificationEventType" minOccurs="0"/>
                                 </xs:sequence>
                             </xs:complexType>
                         </xs:element>                      
diff --git a/v1_5_0/CDT-requestPrimitive-v1_5_0.xsd b/v1_5_0/CDT-requestPrimitive-v1_5_0.xsd
index 7a3558df3d99290d7bbd717ea546b119148a765c..a995bba2a8c9ef307a8b993ff9e2b1bffc628dc7 100644
--- a/v1_5_0/CDT-requestPrimitive-v1_5_0.xsd
+++ b/v1_5_0/CDT-requestPrimitive-v1_5_0.xsd
@@ -38,13 +38,11 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
           <!-- parameter "To" -->
           <xs:element name="to" type="xs:anyURI" minOccurs="1"/>
           <!-- parameter "From" -->
-          <xs:element name="from" type="m2m:ID" minOccurs="1"/>
+          <xs:element name="from" type="m2m:ID" minOccurs="0"/>
           <!-- parameter "Request Identifier" -->
           <xs:element name="requestIdentifier" type="m2m:requestID" minOccurs="1"/> 
           <!-- parameter "ResourceType" -->
           <xs:element name="resourceType" type="m2m:resourceType" minOccurs="0"/>
-          <!-- parameter "Name" -->
-          <xs:element name="name" type="xs:NCName" minOccurs="0"/>
           <!-- parameter "Content" -->
           <xs:element name="primitiveContent" type="m2m:primitiveContent" minOccurs="0"/> 
           <!-- parameter "Role" -->
diff --git a/v2_3_0/CDT-AE-v2_3_0.xsd b/v2_3_0/CDT-AE-v2_3_0.xsd
index a909d4718c2313258c9c613c9864bd1027fb89a7..856893f70d64e031d90154f5974fe4a6a6ce1ff2 100644
--- a/v2_3_0/CDT-AE-v2_3_0.xsd
+++ b/v2_3_0/CDT-AE-v2_3_0.xsd
@@ -48,6 +48,7 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 						<xs:element name="ontologyRef" type="xs:anyURI" minOccurs="0" />
 						<xs:element name="nodeLink" type="xs:anyURI" minOccurs="0" />
 						<xs:element name="requestReachability" type="xs:boolean" />
+						<xs:element name="contentSerialization" type="m2m:serializations" minOccurs="0" />
 
 						<!-- Child Resources -->
 						<xs:choice minOccurs="0" maxOccurs="1">
@@ -81,6 +82,7 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 						<xs:element name="ontologyRef" type="xs:anyURI" minOccurs="0" />
 						<xs:element name="nodeLink" type="xs:anyURI" minOccurs="0" />
 						<xs:element name="requestReachability" type="xs:boolean" minOccurs="0" />
+						<xs:element name="contentSerialization" type="m2m:serializations" minOccurs="0" />
 
 						<!-- Child Resources -->
 						<xs:choice minOccurs="0" maxOccurs="1">
diff --git a/v2_3_0/CDT-commonTypes-v2_3_0.xsd b/v2_3_0/CDT-commonTypes-v2_3_0.xsd
index a0d12e4df30a3ac7c87c455b7f6185adb370b517..e4295d9146318478997eabc611ab9ab5728221db 100644
--- a/v2_3_0/CDT-commonTypes-v2_3_0.xsd
+++ b/v2_3_0/CDT-commonTypes-v2_3_0.xsd
@@ -136,10 +136,10 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 		</xs:restriction> 
 	</xs:simpleType>
 
-    <!--Format is YYYYMMDDThhmmss with no punctuation -->
+	<!--Format is YYYYMMDDThhmmss,ssssss with optional up to 6 digits of fractional seconds -->
 	<xs:simpleType name="timestamp">
 		<xs:restriction base="xs:string">
-			<xs:pattern value="\d{4}(0[1-9]|1[0-2])(0[1-9]|[1-2]\d|30|31)T([01]\d|2[0-3])[0-5]\d[0-5]\d"></xs:pattern>
+			<xs:pattern value="\d{4}(0[1-9]|1[0-2])(0[1-9]|[1-2]\d|30|31)T([01]\d|2[0-3])[0-5]\d[0-5]\d(,\d{1,6})?"></xs:pattern>
 		</xs:restriction>
 	</xs:simpleType>
 	
@@ -163,6 +163,26 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
             <xs:pattern value="[\w/!#$^_.+&amp;\-]+" />
         </xs:restriction>
     </xs:simpleType>
+	
+	
+	<!-- auxiliary data type required to define "serializations" below -->
+	<xs:simpleType name="permittedMediaTypes"> 
+		<xs:restriction base="m2m:typeOfContent">
+			<xs:enumeration value="application/xml" />
+			<xs:enumeration value="application/json" />
+		</xs:restriction>
+	</xs:simpleType> 
+	
+	<!-- "serializations" data type is a list of permitted media types as defined above -->
+	<xs:simpleType name="serializations"> 
+		<xs:restriction>
+			<xs:simpleType>
+				<xs:list itemType="m2m:permittedMediaTypes" />
+			</xs:simpleType>
+			<xs:minLength value="1" />
+		</xs:restriction>
+	</xs:simpleType> 
+	
 
 	<xs:simpleType name="contentInfo">
 		<xs:restriction base="xs:string">
@@ -454,12 +474,21 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 		</xs:simpleContent>
 	</xs:complexType>
 
-    <xs:complexType name="responseTypeInfo">
-        <xs:sequence>
-            <xs:element name="responseTypeValue" type="m2m:responseType" />
-            <xs:element name="notificationURI" type="xs:anyURI" minOccurs="0" maxOccurs="unbounded" />
-        </xs:sequence>
-    </xs:complexType>
+	<xs:complexType name="responseTypeInfo">
+		<xs:sequence>
+			<xs:element name="responseTypeValue" type="m2m:responseType" />
+			<xs:element name="notificationURI">
+				<xs:simpleType>
+					<xs:restriction> 
+						<xs:simpleType> 
+							<xs:list itemType="xs:anyURI" /> 
+						</xs:simpleType> 
+						<xs:minLength value="0" /> 
+					</xs:restriction> 
+				</xs:simpleType>
+			</xs:element>
+		</xs:sequence>
+	</xs:complexType>
     
     <!-- m2m:rateLimit is in the Subscription xsd file -->
 
diff --git a/v2_3_0/CDT-enumerationTypes-v2_3_0.xsd b/v2_3_0/CDT-enumerationTypes-v2_3_0.xsd
index 4b65c8cb654ec3376592f3ed61e6d5e859fdcd44..9b8aced7e5e834211b3cc387c9e0cb0d532d803d 100644
--- a/v2_3_0/CDT-enumerationTypes-v2_3_0.xsd
+++ b/v2_3_0/CDT-enumerationTypes-v2_3_0.xsd
@@ -256,7 +256,9 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
             <!-- NO_PRIVILEGE              -->
             <xs:enumeration value="5105" />            
             <!-- ALREADY_EXISTS            -->
-            <xs:enumeration value="5106" />            
+            <xs:enumeration value="5106" />    
+			<!-- NOT_ACCEPTABLE            -->
+			<xs:enumeration value="5107" />
             <!-- TARGET_NOT_SUBSCRIBABLE   -->
             <xs:enumeration value="5203" />            
             <!-- SUBSCRIPTION_VERIFICATION_INITIATION_FAILED   -->
@@ -533,7 +535,8 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 
 	<xs:simpleType name="notificationEventType">
 		<xs:annotation>
-			<xs:documentation>Used in the notificationEventType element of eventNotificationCriteria attribute of subscruiption resource</xs:documentation>
+			<xs:documentation>Used in the notificationEventType element of eventNotificationCriteria attribute of subscription resource 
+				and in the Notification data object</xs:documentation>
 		</xs:annotation>
 		<xs:restriction base="xs:integer">
 			<!-- Update of Resource -->
diff --git a/v2_3_0/CDT-group-v2_3_0.xsd b/v2_3_0/CDT-group-v2_3_0.xsd
index bd851c33d6654bad74617f71f7fe9c275f79911b..62d8aa99f353f5738ebc4d179643a800c5c1b67b 100644
--- a/v2_3_0/CDT-group-v2_3_0.xsd
+++ b/v2_3_0/CDT-group-v2_3_0.xsd
@@ -39,8 +39,8 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 					<xs:sequence>					
                         <xs:element name="creator" type="m2m:ID" minOccurs="0" />					
 						<xs:element name="memberType" type="m2m:memberType" />
-						<xs:element name="currentNrOfMembers" type="xs:nonNegativeInteger" />
-						<xs:element name="maxNrOfMembers" type="xs:nonNegativeInteger" />
+						<xs:element name="currentNrOfMembers" type="xs:positiveInteger" />
+						<xs:element name="maxNrOfMembers" type="xs:positiveInteger" />
 						<xs:element name="memberIDs" type="m2m:listOfURIs" />
 						<xs:element name="membersAccessControlPolicyIDs" type="m2m:listOfURIs" minOccurs="0" />
 						<xs:element name="memberTypeValidated" type="xs:boolean" />
@@ -68,8 +68,8 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 					<!-- Resource Specific Attributes -->
 					<xs:sequence>
 						<xs:element name="memberType" type="m2m:memberType" minOccurs="0" />
-						<xs:element name="currentNrOfMembers" type="xs:nonNegativeInteger" minOccurs="0" />
-						<xs:element name="maxNrOfMembers" type="xs:nonNegativeInteger" minOccurs="0" />
+						<xs:element name="currentNrOfMembers" type="xs:positiveInteger" minOccurs="0" />
+						<xs:element name="maxNrOfMembers" type="xs:positiveInteger" minOccurs="0" />
 						<xs:element name="memberIDs" type="m2m:listOfURIs" minOccurs="0" />
 						<xs:element name="membersAccessControlPolicyIDs" type="m2m:listOfURIs" minOccurs="0" />
 						<xs:element name="memberTypeValidated" type="xs:boolean" minOccurs="0" />
diff --git a/v2_3_0/CDT-notification-v2_3_0.xsd b/v2_3_0/CDT-notification-v2_3_0.xsd
index c74f69620148f52567732592baee2fbf051b28e2..4dc86643db487cfc7102ed578d09cec3de5c9c98 100644
--- a/v2_3_0/CDT-notification-v2_3_0.xsd
+++ b/v2_3_0/CDT-notification-v2_3_0.xsd
@@ -52,6 +52,7 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
                                                </xs:sequence>
                                          </xs:complexType>
                                       </xs:element>
+                                      <xs:element name="notificationEventType" type="m2m:notificationEventType" minOccurs="0"/>
                                 </xs:sequence>
                             </xs:complexType>
                         </xs:element>                      
diff --git a/v2_3_0/CDT-requestPrimitive-v2_3_0.xsd b/v2_3_0/CDT-requestPrimitive-v2_3_0.xsd
index c7a0fef8fe0504a7fc9a908945ac41fc2ed324bd..843c6ba67a606292c03fc670f227593a151efa7e 100644
--- a/v2_3_0/CDT-requestPrimitive-v2_3_0.xsd
+++ b/v2_3_0/CDT-requestPrimitive-v2_3_0.xsd
@@ -38,13 +38,11 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
           <!-- parameter "To" -->
           <xs:element name="to" type="xs:anyURI" minOccurs="1"/>
           <!-- parameter "From" -->
-          <xs:element name="from" type="m2m:ID" minOccurs="1"/>
+          <xs:element name="from" type="m2m:ID" minOccurs="0"/>
           <!-- parameter "Request Identifier" -->
           <xs:element name="requestIdentifier" type="m2m:requestID" minOccurs="1"/> 
           <!-- parameter "ResourceType" -->
           <xs:element name="resourceType" type="m2m:resourceType" minOccurs="0"/>
-          <!-- parameter "Name" -->
-          <xs:element name="name" type="xs:NCName" minOccurs="0"/>
           <!-- parameter "Content" -->
           <xs:element name="primitiveContent" type="m2m:primitiveContent" minOccurs="0"/> 
           <!-- parameter "Role" -->