XML/XML Schema/maxExclusive

xs:maxExclusive defines a maximum value that can be reached

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"
              >

 1999-01-01T00:00:00Z
</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="beforeY2K" />
  <xsd:simpleType name="beforeY2K">
    <xsd:restriction base="xsd:dateTime">
      <xsd:maxExclusive value="2000-01-01T00:00:00Z" />
    </xsd:restriction>
  </xsd:simpleType>
</xsd:schema>