diff --git a/CDT-timeSeries.xsd b/CDT-timeSeries.xsd
index 15a20d57d98ae48a711e348f6bab0c4991bb5924..351cf939d038b54768a347e4cba8d2f88e84e4bb 100644
--- a/CDT-timeSeries.xsd
+++ b/CDT-timeSeries.xsd
@@ -48,6 +48,7 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 						<xs:element name="currentNrOfInstances" type="xs:nonNegativeInteger" />
 						<xs:element name="currentByteSize" type="xs:nonNegativeInteger" />						
 						<xs:element name="periodicInterval" type="xs:positiveInteger" minOccurs="0" />
+						<xs:element name="periodicIntervalDelta" type="xs:nonNegativeInteger" minOccurs="0" />
 						<xs:element name="missingDataDetect" type="xs:boolean" minOccurs="0" />
 						<xs:element name="missingDataMaxNr" type="xs:positiveInteger" minOccurs="0" />  
 						<xs:element name="missingDataList" type="m2m:missingDataList" minOccurs="0" />
@@ -84,7 +85,8 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 						<xs:element name="maxInstanceAge" type="xs:nonNegativeInteger" minOccurs="0" />
 						<xs:element name="currentNrOfInstances" type="xs:nonNegativeInteger" />
 						<xs:element name="currentByteSize" type="xs:nonNegativeInteger" />						
-						<xs:element name="periodicInterval" type="xs:positiveInteger" minOccurs="0" />  
+						<xs:element name="periodicInterval" type="xs:positiveInteger" minOccurs="0" />
+						<xs:element name="periodicIntervalDelta" type="xs:nonNegativeInteger" minOccurs="0" />
 						<xs:element name="missingDataMaxNr" type="xs:positiveInteger" minOccurs="0" />
 						<xs:element name="missingDataList" type="m2m:missingDataList" minOccurs="0" />
 						<xs:element name="missingDataCurrentNr" type="xs:nonNegativeInteger" minOccurs="0" />