@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" version="1.58; August 5, 2019">
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" version="1.57; March 5, 2019">
   <xs:element name="ReleaseSet" type="ReleaseType"/>
   <xs:element name="ClinVarSet" type="PublicSetType">
     <xs:annotation>
@@ -667,7 +667,6 @@
         </xs:restriction>
       </xs:simpleType>
     </xs:attribute>
-    <xs:attribute name="NumberOfChromosomes" type="xs:positiveInteger" use="optional"/>
     <xs:attributeGroup ref="VCV"/>
     <xs:attributeGroup ref="CVIdentifiers"/>
   </xs:complexType>