To specify the number of digits to the right of the decimal point: : scale « XML Schema « XML Tutorial

1. XML Tutorial
2. XML Schema
3. scale

<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.java2s.com" xmlns="http://www.java2s.com"
  elementFormDefault="qualified">


  <xsd:element name="numbers">
    <xsd:simpleType>
      <xsd:restriction base="xsd:decimal">
        <xsd:precision value="5" />
        <xsd:scale value="2" />
      </xsd:restriction>
    </xsd:simpleType>
  </xsd:element>
</xsd:schema>

 
File: Data.xml
<?xml version="1.0"?>
<numbers xmlns="http://www.java2s.com">34.5</numbers>