XML/XML Schema/boolean

given the limited number of values of the xs:boolean

File: Data.xml
<?xml version="1.0"?>
<data xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://www.wbex.ru Schema.xsd"
              xmlns="http://www.wbex.ru"
              >
   false    
</data>

File: Schema.xsd
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
  elementFormDefault="qualified">
  
  <xsd:element name="data" type="trueOrFalse"/>
  
  <xsd:simpleType name="trueOrFalse">
    <xsd:restriction base="xsd:boolean">
      <xsd:pattern value="true" />
      <xsd:pattern value="false" />
    </xsd:restriction>
  </xsd:simpleType>
</xsd:schema>