Could someone comment whether this is valid or not

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" =
elementFormDefault="qualified" attributeFormDefault="unqualified">
  <xs:simpleType name="NameType">
    <xs:restriction base="xs:token">
      <xs:whiteSpace value="preserve"/>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>

My understanding (section "4.3.6.4 Constraints on whiteSpace Schema =
Components" in http://www.w3.org/TR/xmlschema-2/) is that it is not. =
However, none of the tools I've tried report it. Here is the XSV command =
line and the output

xsv -i -w file:///c:/tmp/WhiteSpace.xsd

<?xml version='1.0'?>
<xsv xmlns="http://www.w3.org/2000/05/xsv" instanceAssessed="false"
  schemaDocs=file:///c:/tmp/WhiteSpace.xsd
  schemaErrors="0" target="[standalone schema assessment]"
  version="XSV 2.7-1 of 2004/04/01 13:40:50">
  <schemaDocAttempt =
URI="file:///c:/tmp/WhiteSpace.xsd"outcome="success" =
source="command line"/>
</xsv>


Regards,
Nikola