Update NeTEx_publication.xsd

react to @Aurige and @trurlurl  s comment

Author: ue71603

xsd/NeTEx_publication.xsd

@@ -600,11 +600,6 @@
 			<xsd:field xpath="@id"/>
 			<xsd:field xpath="@version"/>
 		</xsd:key>
-		<!-- =====TypeOfValue unique========================== -->
-		<xsd:unique name="TypeOfValue_Unique">
-			<xsd:selector xpath="values/TypeOfValue"/>
-			<xsd:field xpath="@id"/>
-		</xsd:unique>
 		<!-- =====TypeOfValue Key========================== -->
 		<xsd:key name="TypeOfValue_Key">
 			<xsd:selector xpath=".//values/TypeOfValue"/>