diff --git a/xsd/netex_part_1/part1_ifopt/netex_ifopt_site_version.xsd b/xsd/netex_part_1/part1_ifopt/netex_ifopt_site_version.xsd
index 65cc87547..7bb21b92f 100644
--- a/xsd/netex_part_1/part1_ifopt/netex_ifopt_site_version.xsd
+++ b/xsd/netex_part_1/part1_ifopt/netex_ifopt_site_version.xsd
@@ -24,11 +24,17 @@
 				<Date>
 					<Created>2010-09-04</Created>
 				</Date>
-				<Date><Modified>2011-02-05</Modified>Name Space changes 
+				<Date>
+					<Modified>2011-02-05</Modified>Name Space changes 
+				</Date>
+				<Date>
+					<Modified>2020-10-10</Modified>New Modes : Add PRESENTATGION To Site ELement
 				</Date>
-				<Date><Modified>2020-10-10</Modified>New Modes : Add PRESENTATGION To Site ELement
+				<Date>
+				    <Modified>2023-12-10</Modified>Enhancement TM v6.2:  Add GROUP OF SITES, SITE STRUCTURE and LEVEL IN STRUCTURE 	  
 				</Date>
-				<Date><Modified>2023-12-10</Modified>Enhancement TM v6.2:  Add GROUP OF SITES, SITE STRUCTURE and LEVEL IN STRUCTURE 	  
+				<Date>
+					<Modified>2023-12-18</Modified>Update comment on LEVEL - RelativeLevelOrder to reflect SITE STRUCTURE enhancement
 				</Date>
 				<Description>
 					<p>NeTEx is a European CEN standard for the exchange of Public Transport data including timetables.</p>
@@ -46,7 +52,7 @@
 					<Requires>http://www.netex.org.uk/schemas/1.0/PATH/netex_prereqfile.xsd</Requires>
 				</Relation>
 				<Rights>Unclassified
- <Copyright>CEN, Crown Copyright 2009-2020</Copyright>
+					 <Copyright>CEN, Crown Copyright 2009-2023</Copyright>
 				</Rights>
 				<Source>
 					<ul>
@@ -609,6 +615,12 @@ Rail transport, Roads and Road transport
 					<xsd:documentation>Whether level is for public use.</xsd:documentation>
 				</xsd:annotation>
 			</xsd:element>
+			<xsd:element name="RelativeLevelOrder" type="xsd:integer" minOccurs="0">
+				<xsd:annotation>
+					<xsd:documentation>Primary relative order of LEVELs for SITE. -1, 0 +1 +2, etc,  0 should be the ground floor. Negative numbers can be used to indicate levels below ground level.  Note that in a complex site alternative setes of level indicators may exist. E.g. Level 1 in one   building part may be   ground level in another; in this case SITE STRUCTUREs and LEVELs IN STRUCTURE can be used to represent the alternative numbering sets.  </xsd:documentation>
+				</xsd:annotation>
+			</xsd:element>
+
 			<xsd:element name="AccessibilityAssessment" type="AccessibilityAssessment_VersionedChildStructure" minOccurs="0">
 				<xsd:annotation>
 					<xsd:documentation>Accessibility values associated with LEVEL.</xsd:documentation>